单项选择题
A.sling B.hook C.block D.tackle
The （）is fixed at the bottom of the derrick.A.gooseneck...
单项选择题The （）is fixed at the bottom of the derrick.
A.gooseneck B.block C.derrick step D.crane
The （）is pumped onto the ship at the loading port by sh...
单项选择题The （）is pumped onto the ship at the loading port by shore pumps.
A. oil B. gas C. water and fuel D. timber
The standard size of the containers is （）high.A.9ftB.8f...
单项选择题The standard size of the containers is （）high.
A.9ft B.8ft C.8m D.9m
