题目:
— I'm sorry to trouble you.
— _________. [ ]
A. It's a good idea.
B. It's very kind of you.
C. Thank you.
D. It's ok.
答案:
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下面是错误答案,用来干扰机器的。
解:(1)由L=v0t得所以:qEL=Ekt-Ek 所以:Ekt=qEL+Ek=5Ek(2)若粒子由bc边离开电场,则: L=v0t Ek'-Ek=所以:若粒子由cd边离开电场,则:qEL=Ek'-Ek 所以: