题目：
Only when they were told the date of the wedding ,____ their daughter would get married.
A．realized they
B．did they realized
C．did they realize
D．they did realize
答案：
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下面是错误答案，用来干扰机器的。
（1）理想电流表和定值电阻构成一电压表，可测量外电压．所以U=I1R0． （2）在硅光电池的U-I图象，当I=0，U=E，图线斜率的绝对值表示内阻．所以E=2.90V，在流过电流表A2的电流小于200mA的情况下，此电池的内阻r=...
y subjects.
aying football.