A trial run is needed before the machine is put into operation.
A trial run is needed before the machine is put into operation.
A、机器投入运行前,须先行试车。
B、机器投入运行前,须先行做实验。
C、试车前,须先投入机器。
D、试车前,须先操作机器。
【正确答案】:A
【题目解析】:trialrun试车;试行;putintooperation投入运行。
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