With more jobs for operating engineers than qualified applicants, operating engineers report being happy.施工工程师：摆弄那些大型玩具可能是很有趣的，比如推土机、前载车、反铲挖土机、刮土机、平地机、装载机、起重机、大型水泵以及空气压缩机。
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... mechanical engineer机械师 operating engineer操作工程师 flight engineer空勤机械师,随机工程师 ...
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