大额主机对账交易（）。 ["仅限于清算中心使用","任意营业网点使用","支行级网点才能使用","营业部才能使用"]
乙烯在农业生产上有何作用？
Windows中，可以打开“开始”菜单的组合键是（）。 ["Shift键+Esc键","Tab键+Esc键","Alt键+Esc键","Ctrl键+Esc键"]
While on watch at sea you must maintain a proper lookout at all times. On a 700-foot cargo vessel being hand-steered during daylight hours in good visibility and clear of any navigational hazards，the lookout may be（）. ["the helmsman","the mate on watch","Either A or B","Neither A nor B"]
连续油管过油管防砂常用的机械砾石充填法有（） ["顶部挤注砾石充填法一种","顶部挤注砾石充填法和向下冲洗砾石充填法两种","顶部挤注砾石充填法、向下冲洗砾石充填法和滑套法三种","顶部挤注砾石充填法、向下冲洗砾石充填法、滑套法和双筛管法四种"]
三相交流异步电动机的拆装应注意的事项有？
