单项选择题
A deepwell pump is a type of（）.
A.screw pump
B.centrifugal pump
C.eductor
D.gear pump
点击查看答案&解析
相关考题
-
单项选择题
A bowline is used to（）.
A.join lines of equal size
B.form a temporary eye (loop) at the end of a line
C.be a stopper
D.keep a line from fraying -
单项选择题
A block that can be opened at the hook or shackle end to receive a bight of the line is a（）.
A.bight block
B.gin block
C.heel block
D.snatch block -
单项选择题
You can safely step in the bight of a line（）.
A.when it is not under strain
B.if both ends are made fast
C.in an emergency
D.at no time
