单项选择题 The type of joint formed when an edge of one plate is laid over the edge of the plate to which it is riveted is a（）.

单项选择题 The type of joint formed when a third small plate is riveted over two plates butted together is called a（）.

单项选择题 The system of valves and cargo lines in the bottom piping network of a tanker that connects one section of cargo tanks to another section is called a（）.