單項(xiàng)選擇題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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2.單項(xiàng)選擇題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