单项选择题
What is the most important difference between the bow type anchor shackle and the D-type anchor shackle? （）
A.The bow type shackle provides a superior connection B.The D-type shackle is weaker than the bow type C.The bow type shackle is weaker than the D-type D.The D-type shackle provides an inferior connection
单项选择题 What is the function of an air receiver in the compressed air system on a ship? （）
单项选择题 What is the female section of a tool joint called? （）
单项选择题 What is the best instrument for establishing a safe working area before welding in a confined space? （）
