[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f_slnidoEaC9TKj5Q26hKT4Lw-zntYQLzdoAQ8XwEiVI":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":31,"type":32},[],"2023-12-20 09:38:39",118018579,[8,9,10,11],"the main bearing","the crankshaft","the dowel pin","the crosshead",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},16,"387be972678c6b7c964b909f59deaab6","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb352afbc1ea29fbb6d8c348e7b56bb46.jpg","轮机英语","f8b3859b28d940bd9515945163c21a93","2-8 主机结构(三)","The piston rods are bored from the top flange to a point opposite the centre of ____",[21,33,36,45,54,63,72,81,90,99],{"answer":22,"createTime":23,"id":24,"options":25,"question":30,"source":31,"type":32},[],"2023-12-20 09:38:38",118018572,[26,27,28,29],"supplied from","supplying to","being supplied for","to be supplied to","The pistons are cooled by oil ____ the forced lubrication system","v1",0,{"answer":34,"createTime":5,"id":6,"options":35,"question":19,"source":31,"type":32},[],[8,9,10,11],{"answer":37,"createTime":5,"id":38,"options":39,"question":44,"source":31,"type":32},[],118018582,[40,41,42,43],"a coil spring","a sealing ring","an oil distributor ring","main seal ring","The lowest ring of a piston is _____",{"answer":46,"createTime":5,"id":47,"options":48,"question":53,"source":31,"type":32},[],118018589,[49,50,51,52],"bottom","middle","top","none of the others","Among the rings of a piston the _____ one is subjected to the greatest load and temperature",{"answer":55,"createTime":5,"id":56,"options":57,"question":62,"source":31,"type":32},[],118018594,[58,59,60,61],"running-in","running-out","running on","running down","Top piston rings are plasma coated. It gives added safety for the_________ of new lines",{"answer":64,"createTime":5,"id":65,"options":66,"question":71,"source":31,"type":32},[],118018599,[67,68,69,70],"larger than","smaller than","equal to","none of the above","The piston rings are manufactured with a diameter _____ the bore of the cylinder",{"answer":73,"createTime":5,"id":74,"options":75,"question":80,"source":31,"type":32},[],118018600,[76,77,78,79],"top of the ring groove","cylinder liner oil film","bottom of the ring groove","back of the ring groove","A diesel engine piston ring face is in direct contact with the _____",{"answer":82,"createTime":5,"id":83,"options":84,"question":89,"source":31,"type":32},[],118018605,[85,86,87,88],"Cast iron","Cast steel","Forged steel","Aluminum","_____ pistons have low inertia and high coefficient of thermal expansion",{"answer":91,"createTime":5,"id":92,"options":93,"question":98,"source":31,"type":32},[],118018606,[94,95,96,97],"heavy wall and intensive cooling","heavy wall and no cooling","thin wall and no cooling","thin wall and intensive cooling","In order to control thermal stresses, some types of modern engines use pistons with _________",{"answer":100,"createTime":5,"id":101,"options":102,"question":107,"source":31,"type":32},[],118018607,[103,104,105,106],"crosshead","crown","piston rod","connecting rod","The purpose of the skirt or trunk in four-stroke cycle engines is to act in a similar manner to a _____"]