采用机动绞磨起吊1.5T的电杆，应选用承重能力不小于（）T的滑车组
A.5
B.7
C.8
D.9
参考答案：D
渗沟的开挖宜自下游向（）行应随挖随即支撑并迅速回填。
A.中游
B.任意方向
C.上游
Each crewmember has an assigned firefighting station. This assignment is shown on the（）.
A.fire fighting plan
B.shipping articles
C.Certificate of Inspection
D.muster list
