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【单选题】
保障机械设备本质安全性的最重要阶段是( )。A.
设计阶段
B.
制造阶段
C.
安装阶段
D.
运行阶段
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反馈参考答案：
举一反三
【简答题】读海底地形图,完成各题。
【单选题】You have the right to refuse work if:
A.
you are busy
B.
the work is difficult
C.
you don't like the task
D.
the work is likely to harm you
【单选题】You have the right to refuse work if:
A.
the work is difficult
B.
you are busy
C.
the work is likely to harm you
D.
you don't like the task
【单选题】If you refuse to be screened at security checkpoint, ________.
A.
you will be allowed to enter sterile area but not to board the flight
B.
you will either be allowed to enter sterile area or to board the flight
C.
you will neither be allowed to enter sterile area nor to board the flight
D.
you will be arrested
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