单选题Gear-type flexible couplings are often used in diesel engine drive trains because they（）Arequire no lubrication under normal operating conditionsBcompensate for gross misalignment in the drive trainCare able to transmit high torque ,even where slight misalignment existsDwill rapidly disconnect the engine from the line shaft
单选题
Gear-type flexible couplings are often used in diesel engine drive trains because they（）
A
require no lubrication under normal operating conditions
B
compensate for gross misalignment in the drive train
C
are able to transmit high torque ,even where slight misalignment exists
D
will rapidly disconnect the engine from the line shaft
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