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【判断题】
词组taillight control relay的意思是:尾灯控制继电器A.
正确
B.
错误
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【简答题】一均匀带电直线长为d,电荷线密度为 ,以导线中点O为球心,R为半径(R>d)作一球面,如图所示,则通过该球面的电场强度通量为___.带电直线的延长线与球面交点P处的电场强度的大小为___,方向___.
【简答题】(此题空内填写A/B/C/D) 一个均匀带电直线的电荷线密度为λ,带的总电量为Q,长为L,则此带电直线上长为 dx 的任意一个电荷元 dq 所带的电量为 [(A) λd x; (B) λ x;(C)Qdx; (D)Qx;(E)Q/L] 此电荷元与下图中的点电荷 之间的库仑力大小为 [(A) ;(B) ;(C) ;(D) ] 。 如果题中公式不能正常显示,请看以下截图
【单选题】The first intimation, apparently, was when three-year-old Yves told his mother that her shoes did not go with her dress. They were at home in Oran, a dull commercial town in French-ruled Algeria, wher...
A.
Mr. Saint Laurent first showed his talent for fashion in 1958 when he worked for Dior.
B.
the superlatives having been lavished on Mr. Saint Laurent were meant to exaggerations.
C.
Mr. Saint Laurent was not free from physical and emotional sufferings in his life.
D.
Mr. Saint Laurent managed to build up his own brand name all by himself in 1961.
【单选题】Under no circumstances in the last three months______ for leave because of personal affairs．
A.
did she ask
B.
she asked
C.
has she asked
D.
she has asked
【简答题】定时器 T1 ,工作方式 1 ,定时器使用, T1 启动位仅由 TR1 控制,定时时间为 5000us , T0 对应中断允许,令时钟频率为 12MHZ, 试完成 T1 中断初始化程序编写
【单选题】函数f(x,y,z)= ,则gradf(1,-1,2)为( ).
A.
（2，-2, 4）
B.
（2，-2, -4）
C.
（-2，-2, 4）
D.
（2，2,- 4）
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