单项选择题
When a sudden increase in steam demand comes to normal, the drum pressure will and water level in the drum will（）.
A.rise, rise also B.rise, drop C.drop, rise D.drop, drop also
单项选择题 If a hydraulic pump is overheating, the cause may be （）.
单项选择题 The motor for the fresh water pump （）.
单项选择题 I remember （）the oil separator the day before yesterday But it failed again.
