锅炉水处理用耐酸管道设计的要求是什么?
A ship station on receiving a shore-to-ship distress alert should(). keep silence。 interfere with such communication。 establish communication as directed and render such assistance as is required and appropriate。 refuse communication as directed and render such assistance as it required and appropriate。
如果要在工作表的第D列和第E列中间插入一列,应选中(),然后再进行有关的操作。 D列。 E列。 D和E列。 任意列。
货物转向架组成后,上架体必须转动灵活,活心盘上架体还应()滑动灵活。 侧向。 左右。 横向。 纵向。
除氧器管道设计的要求是什么?
下列关于职业道德奖惩机制的说法,错误的是()