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【单选题】
图中圆柱被P平面截切后,截交线的形状是:A.
圆
B.
椭圆
C.
矩形
D.
抛物线+直线
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皮皮学刷刷变学霸
举一反三
【单选题】晶体管调压器中，晶体管的占空比：（）
A.
与晶体管的相对导通时间成正比；
B.
与晶体管的导通时间成正比；
C.
与晶体管的截止时间成正比；
D.
与晶体管的相对截止时间成正比。
【简答题】A．September 13th. B．September 12th. C．October 13th. D．October 12th.
【单选题】By the end of September 2013，＿＿＿＿．number of netizens in China has hit ＿＿＿record high of 604 million．
A.
the；the
B.
a；a
C.
a；the
D.
the；a
【简答题】如图，DE ∥ AC，BE：EC=2：1，AC=12，则DE=______．
【单选题】American Football Every weekend from September through January．football seems to De the most important event in the lives of millions of Americans．Thousands of people go to stadiums all over the count...
A.
those that attend games of American football
B.
when a famous player taking part
C.
once in a while
D.
only a few people actually take part in
E.
chance to identify with athletes
F.
more fans watch the games on the television or listen to broadcasts on the radio 第 46 题 请选择（1）处的最佳答案．
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