变换系统长期计划停车应（）。
A、切除原料气
B、卸压并用氮气置换
C、加盲板隔离
D、充氮气保护
参考答案：A, B, C, D
婴儿开始添加蛋黄的月龄是()
A．1个月以后
B．2个月以后
C．3个月以后
D．4个月以后
E．1岁以后
A ROUND THROUGH THE VESSEL CARRIED OUT BY A CREW MEMBER OF THE WATCH AT CERTAIN INTERVALS SO THAT AN OUTBREAK OF FIRE MAY BE PROMPTLY DETECTED defines（）.
A.Fire patrol
B.Fire control
C.Smoke detection
D.Fire drill
