使用放射性同位素、射线装置的单位申请领取许可证,应当具备:有完善的辐射事故应急()。
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无线调车灯显设备正常使用时停用手信号,对灯显以外的作业指令采用()方式。
A. 纸面
B. 通话
C. 电报
D. 指令
When a teacher wants to test students' listenin1g skills,grammar.vocabulary and pronunciation,which of the following test format is the most suitable one?
A. True or false questions.
B. Completion
C. Dictation.
D. Translation.
大肠杆菌“IMVC”试验的结果是()
A. --++
B. -+-+
C. ++--
D. +-+-
E. +--+
Cracks in the cylinders and cylinder covers may () unequal heating
A. result in
B. result from
C. result