The datum from which the predicted heights of tides are reckoned in the tide tables is（）. ["mean low water","the same as that used for the charts of the locality","the highest possible level","given in table three of the tide table"]
Domestic water pump is started automatically by （） which operates as the water level falls to a predetermined level. ["a level controller","a temperature switch","a pressure switch","a floating ball"]
废弃危险化学品处置办法有（）。 ["地质处置","海洋处置","焚烧处置"]
开户行在为企业办理网上银行注册登记的业务操作过程中，要严格执行（），相互复核，降低银行业务操作风险。 ["权限管理","双人操作","内部传递","发放登记"]
MPEG-4动态图像压缩标准在信息描述中首次采用了“对象”（Object）概念。
通用飞机的救生系统包括哪些部分？
