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【单选题】
以下说法中正确的是:A.
电解质溶液中各离子迁移数之和为1 ；
B.
电解池通过l F 电量时，可以使1m ol物质电解 ；
C.
因离子在电场作用下可定向移动，所以测定电解质溶液的电导 率时要用直流电桥；
D.
无限稀电解质溶液的摩尔电导率可以看、负离子无限稀 摩尔电导率之和，这一规律只适用于强电解质。
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【多选题】以下打混凝土预制桩一按规定中,哪些做法是正确的:()。
A.
吊桩前应将桩锤提升到一定位置固定牢靠 , 防止吊桩时桩锤坠落。
B.
起吊时吊点必须正确 , 速度要均匀 , 桩身应平稳 , 必要时桩架应设缆风绳。
C.
桩身附着物要清除干净 , 起吊后 , 人员不准在桩下通过。
D.
吊桩与运桩发生干扰时 , 应停止运桩。
E.
插桩时，手脚严禁伸入桩与龙门之间。
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