The writer thought the man might be ______.
A.someone who had always been a tramp
B.someone who had once worked for him
C.someone who had once been his boss
D.someone he often saw in the park
第2题
现场检查与校对压力表采用的方法有互换法,标准压力表校对法和()三种。
A.直视法
B.送检法
C.实验法
D.落零法 本题
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