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A.正确 B.错误 [单选题]保证电气检修人员人身安全最有效的措施是（ ）。
A.A.悬挂标示牌 B.B.放置遮栏 C.C.将检修设备接地并短路 D.D.不准接触 [单项选择]该患者最可能的诊断是
A. 二尖瓣狭窄 B. 二尖瓣关闭不全 C. 主动脉瓣狭窄 D. 主动脉瓣关闭不全 E. 二尖瓣狭窄并二尖瓣关闭不全 [单选题]比例调节过程的余差与调节器的比例度( )
A.成反比 B.成正比 C.的平方成正比 D.没有关系 [单项选择]一般双子叶植物叶片上的气孔器主要分布在（）。
A. 上表皮 B. 下表皮 C. 叶边缘 D. 上下表皮 [单选题]多层式或多层式热拌热铺沥青混合料面层之间应喷洒()。P87
A.封层 B.透层油 C.粘层油 [填空题]《铁路旅客运输服务质量规范》（铁总运〔2016〕247号）规定，出站检票人员提前到岗，检查<--NRC-->、出站显示屏状态和内容。
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