二氧化碳闪蒸塔三段底为什么要设甲醇液位高联锁报警?
参考答案:
1.防止甲醇液位高举入低压氮系统。
2.防止液体封住气提氮入口,引起低压N2系统流量,压力波动。
Seeing the man on the bike with a boy at the front and the other at the back, the policeman signed _______stop.
A.to the man
B.to the man to
C.for the man for
D.to the man for