发车前，机班必须两人确认LKJ本/补状态设置正确，进行呼唤应答后方可动车。
对于严重腐蚀环境下采用大掺量粉煤灰的混凝土结构或构件有何养护要求？
In a Williamson turn，the rudder is put over full until the（）. ["vessel has turned 90°From her original course","vessel has turned 60°From her original course","vessel is on a reciprocal course","emergency turn signal sound"]
较适用于库存空间大和存放的商品量少而品种多的情况的储存方法是（）。 ["随机储放","定位储放","分类存放","共同储放"]
If you see someone fall overboard from a ship，you should（）. ["immediately jump in the water to help the individual","call for help and keep the individual in sight","run to the radio room to send an emergency message","go to the control room for the distress flare"]
直接与海水或盐渍土接触的混凝土有何养护要求？
