單項(xiàng)選擇題

A crankshaft whose center of gravity coincides with its center line is said to be（）
Ⅰ.statically balanced
Ⅱ.dynamically balanced

A.Ⅰ only
B.Ⅱ only
C.both Ⅰ and Ⅱ
D.neither Ⅰ nor Ⅱ

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單項(xiàng)選擇題

In a trunk type diesel engine piston, the thickness of the head or crown is determined by the（）
Ⅰ.statically balanced
Ⅱ.heat dissipation requirement

A.Ⅰ only
B.Ⅱ only
C.both Ⅰ and Ⅱ
D.neither Ⅰ nor Ⅱ

單項(xiàng)選擇題

A condition contributing to diesel engine piston rings sticking in the ring grooves, is insufficient ring clearance at the ring（）
Ⅰ.gap
Ⅱ.side

A.Ⅰonly
B.Ⅱ only
C.both Ⅰ and Ⅱ
D.neither Ⅰ nor Ⅱ