The diesel engine valve subjected to most severe conditions of service is the ().
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
根据《中华人民共和国海船船员适任考试发证规则》的规定,在中国籍海船上任职的船长、甲板部高级船员金额值班水手应当持有与其所服务的()和所担任的植物相符的有效适任证书。
①船舶航区;
②船舶种类;
③主机功率;
④船舶吨位。
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