单项选择题
When the bearing becomes dry from lack of oil, the motor shaft may heat to （）an extent （） it welds itself to the bearing.
A.either；or
B.neither；nor
C.such；that
D.so；that
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An indicator on the main switchboard should show （） the emergency battery is in service or not.
A.that
B.when
C.if
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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
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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
