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[问答题] 何谓沉积岩?其主要特征是什么?

雨天时按规定平煤刮板机需停用,其目的是() ["防止将过多的水份被送入炭化室内","防止影响余煤卷扬送余煤效率","保护平煤刮板机","雨天余煤量太多,减少进入余煤卷扬中的煤量"] 关于取款密码及查询密码说法正确的是()。 ["代办及批量开存折,密码为身份证号后六位","在取款转账等资金转出时使用,在办理书面挂失重写磁等特殊业务时用于辅助对客户身份的确认","用于业务查询,查询密码遗忘时,须办理密码挂失","一卡通客户首次登陆自助渠道时,必须通过取款密码进行登陆"] Fuel is delivered into the combustion space by (). ["a cooling system","a lubricating system","an electric system","an injection system"] Fuel injection valves should be taken out, cleaned, and lifting checked every (). ["two to four months","four to six months","six to eight month"] 盘圆(钢筋)类货物的海运特性包括()。 ["与舱底之间的摩擦系数较小","散货船全船装载时常会引起GM过小","怕潮湿","货物的积载因数较大"] 何谓沉积岩?其主要特征是什么?
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