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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

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出自：海船船员证

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