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

A vessel proceeding along the bank of a river or channel has the tendency to（）.

Normally the mariners care more about the（）of tide.

Flying across the ocean and far into the space has mainly brought people ________.( )

在我国沿海某港口水域航行的船舶应遵守（）

Once vessel has been cleared by Port Health or Immigration （）must proceed to appropriate berth or anchorage．

沿海内河船舶保险中，船舶在航行中船员和船舶同时失踪，失踪满（）以上称为失踪，属于保险责任。

Mariners proceeding across the main routes are（）to do so at as wide an angle as practicable.

Mariners are reminded that they should proceed in the general direction indicated by the arrows or，if（）a lane，they should do so as nearly as practicable at right angles to it.

A current moving across a lock entrance toward the river or toward the dam is called a(n)（）.

The cooling of the piston is carried out by circulating （） across the underside of the crown and inside the ring belt or through specially shaped passages.

本船航行接近目的港，ECDIS当前的海图显示为通常在大洋航行时选择的基础显示，则（）。