单选题（） are commonly used in mechanical-hydraulic governor（调速器） to sense engine speeds.ABulbsBBulksCFlyweightsDFlywheels
单选题
（） are commonly used in mechanical-hydraulic governor（调速器） to sense engine speeds.
A
Bulbs
B
Bulks
C
Flyweights
D
Flywheels
参考解析
解析：
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