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【单选题】
下列变量名中 是合法的。A.
char_1,i,j
B.
x*y,a.1
C.
x\y,a1234
D.
end,1bcx
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【简答题】受力构件内一点附近取一微元体，承受应力如图所示，其中【图片】，试求该点最大切应力为多少MPa？（填写数字） 【图片】
【单选题】£ Here are some time markers often used with the past simple (PS) or the present perfect (PP). Choose PS or PP for the following words. Some can be used with both. this week
A.
past simple (PS)
B.
present perfect (PP)
C.
both
【单选题】£ Here are some time markers often used with the past simple (PS) or the present perfect (PP). Choose PS or PP for the following words. Some can be used with both. already
A.
past simple (PS)
B.
present perfect (PP)
C.
both
【单选题】£ Here are some time markers often used with the past simple (PS) or the present perfect (PP). Choose PS or PP for the following words. Some can be used with both. in 2007
A.
past simple (PS)
B.
present perfect (PP)
C.
both
【单选题】“通过批判旧世界来发现新世界”是
A.
空想社会主义预见未来社会的方法
B.
马克思主义预见未来社会的方法
C.
唯物主义预见未来社会的方法
D.
唯心主义预见未来社会的方法
【单选题】£ Here are some time markers often used with the past simple (PS) or the present perfect (PP). Choose PS or PP for the following words. Some can be used with both. just
A.
past simple (PS)
B.
present perfect (PP)
C.
both
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