An integral part of a blowout preventer that serves as the closing element on an open hole，and whose ends do not fit around the drill pipe but seal against each other and shut off the space below completely is the（）.
1、The shear rams of a ship blowout preve
The shear rams of a ship blowout preventer stack are used in emergency well control to（）.Aclose and seal around the drill pipeBclose and seal around casingCcut off pipe inside the preventer stackDclose and seal around drill collar
2、An important part of the skill of list
An important part of the skill of listening is being able to predict what the speaker is going to say next.（）A正确B错误
3、A sylphon cell is a part of a（）.
A sylphon cell is a part of a（）.Amaximum thermometerBbarographCthermographDhygrometer
4、What is used to prevent twisting of a
What is used to prevent twisting of a towing bridle?（）AA bittBA bulkheadCA V-springDA fishplate
5、The purpose of a preventer as it is us
The purpose of a preventer as it is used on a conventional yard and stay cargo rig is to（）.Aallow greater than normal loads to be handled...
6、The sequence of parts in a generally
The sequence of parts in a generally used fuel oil supply system for a main engine is （）(1)tanks in the double bottom(2)centrifuges(3)service...