The（） is fitted in pair one is the main valve, the other the auxiliary or standby.

Valve overlap is the period during which （）.

On a small boat，which knot is best suited for attaching a line to the ring of an anchor?（）

Off hire is when a vessel breaks down，strands，or has any damage that prevents the working of cargo or delays the sailing of the vessel．Under which of the following charter parties is off hire most likely to be mentioned?（）.

Which of the following is the MOST important consideration when purchasing a new server for a mission critical application？（）

The valve which is most suited for regulating the flow through a pipeline is a （）

船长应负责保管的船舶安全管理方面的证书有（）。 Ⅰ．符合证明； Ⅱ．符合证明的副本； Ⅲ．船舶安全管理证书； Ⅳ．船舶安全管理证书的副本。

Which one of following statement is not true concerning the suitable sites of the direct acting relief valve and the pilot operated relieve valve?（）

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

Which of the following is most suitable for the cultivation of linguistic competence?

What is the most appropriate title for the passage?

The variation for most given areas undergoes（）change，the amount of which is also noted on charts.