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飞行器RCS计算前置处理中裁剪曲面剖分算法在​雷​达​散​射​截​面​(​R​C​S​)​计​算​中​,​首​先​需​要​将​物​体​的​表​面​进​行​三​角​剖​分​,​称​为​前​置​处​理​,​三​角​片​单​元​的​边​长​通​常​为.个​波​长​(​一​般个​波​长​取c​m​)​.​飞​行​器​外​表​形​状​复​杂​,​在​建​立​数​学​化​模​型​中​,​使​用​了​大​量​的​裁​剪​曲​面​,​曲​面​之​间​的​关​系​非​常​复​杂​,​而m​m​边​长​的​三​角​片​剖​分​,​使​得​飞​行​器​的​三​角​片​单​元​的​数​目​巨​大​,​给​前​置​处​理​带​来​难​度​.​对​此​,​提​出​了​一​种​裁​剪​曲​面​三​角​网​格​剖​分​的​方​法​.​利​用​飞​行​器​外
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您查找的资源存在问题，因而无法显示。单目,双目运算符怎么回事?前置和后置的区别C++
单目,双目运算符怎么回事?前置和后置的区别C++
目就是操作数，单目就是一个操作数的操作符，比如正负号，++ --，作用域操作符；双目就是两个操作数的。
前置自增/自减是先将自身变量改变在参与表达式运算，而且前置运算返回的是左值也就是变量，比如++i = 6，
而后置的是先用本来的数值参与表达式运算，再改变其自身的值，并且后置运算返回的是右值也就是常量i++ = 6就是错的，这一点很重要，比如
i = 6;
cout && i++ && ++i &&
最终输出的结果会是78，因为表达式是从右往左算，先算++i，所以i = 7,再算i++,所以首先输出7，因为有i++所以i最终为8，并且第二个位置输出的是变量的值，所以就是78
的感言：谢谢
其他回答 (1)
单目是指只有一个运算数的运算符，称为单目运算符．双目是指有两个运算数的运算符．前置和后置的主要区别在于如果是前置运算符的话，运算数本身先计算，然后再参与其他运算数的运算，而后置运算符的话，运算数先参与其他运算符的计算，然后本身再运算
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编程领域专家From Wikipedia, the free encyclopedia
Poljot (: Полёт, literally meaning "flight"), is a brand of / , produced since 1964 by the First
Watch Factory (: Первый Московский Часовой Завод, ПМЧЗ, Perviy Moskovskiy Chasovoy Zavod). The flagship brand of the USSR's watch industry, Poljot produced numerous historical watches used in many important space missions, including the world's first space watch worn by .
1930s' FSWF wristwatch with Dueber-Hampden designed movement
1930s watch from Kirov First State Watch Factory, Moscow. Face with portrait of Joseph Stalin.
Poljot Aviator caliber 3133
Founded in 1930 under orders from , the First State Watch Factory (: Первый Государственный Часовой Завод - 1ГЧЗ) was the first large scale Soviet watch and mechanical movement manufacturer. Via its USA-based trading company , the Soviet government bought the defunct
in 1929, and the
of . It moved twenty-eight freight cars full of machinery and parts from the USA to Moscow in order to establish the factory. Twenty-one former Dueber-Hampden watchmakers, engravers and various other technicians helped to train the Russian workers in the art of watchmaking as part of the Soviet's . Interestingly, the movements of very-early products were still stamped "Dueber-Hampden, Canton, Ohio, USA" (examples of these watches are very collectible today). In 1935 the factory was named after the murdered Soviet official .
As the Germans closed in on Moscow in 1941, the factory was hurriedly evacuated to
(: Златоу?ст). By 1943 the Germans were in retreat, and the factory moved back to Moscow, adopting the "First Moscow Watch Factory" name (: Первый Московский Часовой Завод - 1МЧЗ).
In 1947 the first wrist watches under the brand name "Pobeda" and the first Marine Chronometers and Deck watches are produced. By 1951 the production of wrist watches increases to 1.1 million. In 1975 new machinery and equipment for manufacturing complex watches are partly imported from Switzerland. The first chronograph "Okean" (caliber 3133) is produced for the space station "Sojuz-23."
In 1990 production of watches and clocks reaches 5 million pieces and in 1991 the international award "Golden Trophy for Quality" is awarded in Madrid.
Sturmanskie (First Moscow Watch Factory), 1949. The stamp of Russia, 2010.
"Gagarin" Sturmanskie
On April 12, 1961
became the first man in space. During his historic flight he wore a Sturmanskie pilots wristwatch (a transliteration of Штурманские which actually means "Navigator"). This watch was not specially commissioned for the flight, they were standard issue to all air force pilots at the time. The success of the mission however lead to the factory being awarded the Poljot (: Полет) name in 1964.
wore a FMWF Strela (transliteration of СТРЕЛА, which actually means "Arrow") chronograph during his historic first space walk, thus cementing Poljot's place in space history. As with Gagarin's first flight, Leonov's watch was not specially commissioned. The Strela replaced the Shturmanskie as the standard issue pilots watch. In the late 1970s, the Strela itself was replaced by a new breed of chronographs based around the (then new) 3133 movement (an original Russian movement similar in functionality to the Swiss Valjoux 7734, but with higher number of jewels 23 vs 17 and lever movement operating at 21,600 bph vs 18,000 bph). Poljot 3133-based watches continued where their predecessors left off and were taken into space by cosmonauts from Russia, France, Germany and Ukraine. On the wrist of cosmonaut , a Poljot 3133-based watch set a space record for the longest space flight in history.
Chronograph Poljot "Blue Angels", caliber 3133.
During the Soviet era, Soviet watch brands including Poljot, but also
watches, were marketed in the
under the brand "". Today's Sekonda company, a British distributor of ubiquitous fashion watches, has no connection to any Russian watches. At the turn of the 21st century, the First Moscow Watch Factory began reproducing many of their most famous models as limited edition commemorative pieces. Replicas were made of the famous 1960s Shturmanskie worn by , the 1940s Kirova pilots chronograph, and the 1970s Ocean (Океан) chronograph. All of the replicas became sought-after collectibles.
In late 2003, rumors predicting the demise of the Poljot brand circulated on the Internet. According to the rumors, the First Moscow Watch Factory was to cease producing their own models and become a source of inexpensive movements for other European watch brands. These rumors never came to fruition. Instead, in the late 2000s, the company was bought by the businessman , becoming one of the companies of his new luxury group, including: , and the channel .
in Saint Petersburg, Russia
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