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单选题
In a diesel engine, when installing new piston rings it is important to check() Ⅰ.ring gap clearance Ⅱ.side clearance
A

Ⅰ only

B

Ⅱ only

C

both Ⅰ and Ⅱ

D

neither Ⅰnor Ⅱ


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