【单选题】The main function of the drawworks on a ship is to().
A.
transport tubulars from the pipe racks to the derrick floor
B.
maintain constant tension on the marine riser
C.
store and secure the excess drill line
D.
lower and hoist the drill string into and out of the drilled hole
【多选题】就游客的旅游活动而言,导游讲解服务与旅行生活服务之间的关系是( )的关系。
【判断题】淬透性好的钢,淬火后硬度一定很高。A. 对 B. 错
【多选题】就游客的旅游活动而言,导游讲解服务与旅行生活服务之间是( )的关系。