单选题
发布日期:2020-04-10
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银盐感光材料经曝光、显影后,在安全光下就可以看见影像了。
下列关于文件及其操作的描述中,正确的是( )。
两个机器部件在做相反方向运动的接触面之间会产生热量,加入润滑油后,可以降低摩擦阻力,减少热量产生,还可以带走热量。这就表明润滑油具有()作用
船舶在浅水区航行时,决定船舶下沉量的因素,下列正确的是:() Ⅰ、船舶航速越高,船体的下沉量越大 Ⅱ、船体越肥大,船体的下沉量越大 Ⅲ、航道越窄,水深越浅,船体的下沉量越大
()的单位是mol。
申请享受城市低保待遇的人员,属于退休和失业的,由当地什么机构认定其收入并出具证明?
从事路灯安装、()的操作人员必须经有关部门的专业培训、考试合格取得证书方可上岗工作。
肾综合征出血热大出血主要原因除外下哪项()
下列有关导游人员管理制度的表述中,错误的是______。
传播信息的载体不包括()。
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