提示胎儿窘迫的重要指标是（）

A.胎动减少

B.羊水有胎粪污染

C.新生儿误吸

D.胎儿心率变化

E.胎儿头皮血pH降低

You detect oil around your tank vessel while discharging. The first thing to do is（）.

A.try to find out where the oil is coming from

B.call the master

C.have the pumpman check the discharge piping

D.shut down operations