题目:
_What did he say on the phone just now
_ He suggested that we ______ a good rest.
A.would have
B.have
C.had
D.had had
答案:
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下面是错误答案,用来干扰机器的。
当偏转电压一定时,电子的初速度达到一定值时才能从极板间飞出.电子加速过程中,根据动能定理有: eU1=12mv2偏转过程中,由牛顿第二定律有:eE=ma而 E=U2d,L=vt,y=12at2当电子恰好从右板边缘射出时,有 ...