A vessel reduces speed without backing. The rate that her speed through the water decreases depends primarily on the（）.

All persons or vessels within the lock area，including the lock approach channels，come under the authority of the（）.

For operations in pack ice，a vessel should（）.

When operating in an area where sea ice and icebergs are present，which statement is TRUE? （）

If the situation arose where it became necessary to tow a disabled vessel，which statement is TRUE concerning the towing line?（）.

Before entering an ice area，the ship should be（）.

A vessel is proceeding downstream in a narrow channel on the Western Rivers when another vessel is sighted moving upstream. Which vessel has the right of way? （）

A vessel showing a rigid replica of the International Code flag A is engaged in（）.

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

In most cases，when a large merchant vessel enters shallow water at high speed the（）.