单项选择题
The guide shoes are secured to the crosshead by means of（）
A.through bolts B.end chock bolts C.side chock bolts D.tap-bolts
单项选择题 Which one of the following repair will cost the least cost?（）
单项选择题 Why shiprepair is an inherently difficult business to manage in the conventional sense?（）
单项选择题 In order to improve the efficiency of the communication with shore personnel, you should（）
