单项选择题
The ship is listing too much due to your faulty method in loading operation.You must keep her（）.
A.flat B.up C.upright D.vertical
单项选择题 The ship should have a slightly deeper draft（）.
单项选择题 The ship should reduce speed in（）.
单项选择题 The ship should reduce speed in the thick fog because of（）.
