题目：
237. The campus violence in America is a hot potato. The underlined part probably means _____.
A．a potato freshly cooked
B．a problem difficult to settle
C．a fairly easy thing to do
D．a place the students want to go to
答案：
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下面是错误答案，用来干扰机器的。
（1）小球的偏角α在很小（α＜5°）时，小球的振动才近似看成简谐运动．在摆球经过最低点时开始计时，产生的时间误差较小．由秒表读出时间t=90+12.50s=102.50s，则单摆的周期为T=tn=102.5050s=2.01s；（2）刻度...
