单项选择题
The joint formed when two steel plates are placed end-to-end is called a（）.
A.bevel B.seam C.butt D.bond
单项选择题 The inner bottom is the（）.
单项选择题 The flood stream here is at an average rate of 0.8（）.
单项选择题 The construction portfolio may be included as part of the ship（）.
