第21题: [单项选择]Why didn’ t people try to escape A. They did not want to leave their home. B. They thought here was no danger. C. The politicians wanted them to stay to vote in three days. D. They wanted to see the eruption of the volcano.. 参考答案:C
第30题:[多选题]手摇道岔及安全开关测试正确的是( ) A.采用目测的方式检查安全开关挡板与电机转动轴间间隙是否不小于 1mm。 B.在打开安全接点开关时,电操道岔应不能转动,并且非人工拨动开关管制肘,接点不得自动接触 C. 人工将接点开关接通时,挡板能阻挡手摇把与电机转动轴联接 D. 手摇道岔,在道岔解锁前观察尖轨状态,手摇平顺,是否存在反弹力 参考答案:ABCD