关于建筑机具的安全操作,正确的说法是( )。 关于建筑机具的安全操作,正确的说法是( )。A.建筑机具只能由经过专业培训、考核合格取得特种作业操作证的专业人员使用 B.机械设备发生故障,必须切断电源后,操作 分类:基础知识 题型:单选题 查看答案
Milk That Paid a Medical Bill One day, a poor boy who was s Milk That Paid a Medical Bill One day, a poor boy who was selling goods from d 分类:基础知识 题型:单选题 查看答案
The experiment proved to be satisfactory. The experiment proved to be satisfactory.A.Right B.Wrong C.Not mentioned 分类:基础知识 题型:单选题 查看答案
The food is insufficient for three people. The food is insufficient for three people.A.instant B.infinite C.inexpensive D.i 分类:基础知识 题型:单选题 查看答案