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（）.

The strictest load line regulations apply to（）.

A.gas carriers
B.freighters (break-bulk)
C.passenger ships
D.tankers

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The shearing stresses on a ship’s structure are usually greatest at（）.

A.the bow
B.the stern
C.midships
D.the ship's quarter-length points

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