单项选择题
The patches where rust have been removed should be wiped clean before paint is（）.
A.applied B.supplied C.replied D.complied
单项选择题 The permant dunnage attached to the frames of the ship that aids in ventilation is (are) the（）.
单项选择题 The productivity of working shifts can be improved through a decrease of（）.
单项选择题 The purpose of cant frames in steel vessel is（）.
