参考答案: (1)甲 (2)直到P3及P1、P2的像被P4挡住,定下P4的位置

参考答案:

1)甲

2)直到P3P1P2的像被P4挡住,定下P4的位置

31.2

评分标准:共8分,其中(12分,(2)(3)各3分;

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