单项选择题
A.A flashing yellow light
B.A red light visible all around the horizon
C.A green light visible all around the horizon
D.An illuminated red and yellow caution flag
单项选择题 You must shift a weight from the upper tween deck to the lower hold. This shift will（）.
单项选择题 You will load and carry a bulk cargo of sulphur at ambient temperature. Which statement is true?（）.
单项选择题 You’d better（）the optional cargo block stowage in the tweendecks, then it can be easily discharged either at Shanghai or Dalian.