单项选择题
Upon underwater（）by divers，there are no apparent（）on the bottom plates of the said vessel.
A.detection，defects B.defection，defects C.defects，defection D.defects，detection
单项选择题 To reduce the number of strakes at the bow，two strakes are tapered and joined at their ends by a single plate. This plate is known as a（）.
单项选择题 Those ship’s tanks that are particularly important for trimming the ship are the（）.
单项选择题 The words PIPE，BUTT，TUN AND PUNCHEON all refer to（）.
