单选题A crankshaft whose center of gravity coincides with its center line is said to be （）.Adynamically balancedBstatically balancedCcounter balancedDresonantly balanced
单选题
A crankshaft whose center of gravity coincides with its center line is said to be （）.
A
dynamically balanced
B
statically balanced
C
counter balanced
D
resonantly balanced
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