比较共享总线型结构CNC装置和共享存储结构CNC装置的工作特点及优缺点?
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船员的疲劳属于职业疲劳。防止疲劳和及时消防疲劳,避免在过度疲劳情况下作业是确保船上持续性安全的必要条件之一。
A. 正确
B. 错误
Regulations require that cargo pumprooms on tank barges (constructed in 1965) carrying grades B or C liquid cargoes have power ventilation systems which can completely change the air in ().
A. 1 minute
B. 3 minutes
C. 5 minutes
D. 10 minute