[单选题]关于活塞销的材料、结构与表面处理，正确的有________。I．铸铁II．合金钢III．中空结构IV．实心结构V．表面退火VI．表面淬火

正确答案 ：D

II+III+VI

[单选题]所谓气阀间隙是指()

正确答案 ：C

气阀的热膨胀间隙

[单选题]In the Second paragraph, the underline word "Who", in such a context, stands for_____.

正确答案 ：C

the Administration, the recognized organization or the nominated surveyor responsible for issuing the relevant Certificate

[单选题]某轮罗航向030°，罗经差ΔC-3°，则该轮的真航向TC等于：()

正确答案 ：B

027°

[单选题]A small boat takes pilots to and from ships, it’s called a ________

正确答案 ：C

pilot boat

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