单项选择题
A.either；or B.neither；nor C.such；that D.so；that
An indicator on the main switchboard should show （） the...
单项选择题An indicator on the main switchboard should show （） the emergency battery is in service or not.
A.that B.when C.if D.whether
When a sudden increase in steam demand comes to normal,...
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
If a hydraulic pump is overheating, the cause may be （）...
单项选择题If a hydraulic pump is overheating, the cause may be （）.
A.excessive internal leakage in the pump B.low discharge pressure and fluid flow C.excessive fluid level in the hydraulic reservoir D.operation of the pump at 100% efficiency
