单项选择题
The section of each end of a barge which is heavily reinforced to take the pressure of pushing is called the（）.
A.Headlog B.Towhead C.Collision bulkhead D.Bullnose
单项选择题 The riding pawl is（）.
单项选择题 The primary barrier of a bulk carrier is formed by（）.
单项选择题 The permissible SWSF and SWBM are assigned by（）.
