总价一定，单价和数量（　　）

A．成正比例

B．成反比例

C．不成比例

D．以上都不对

To secure a vessel in a particular place by means of chains or ropes made frast to the shore, to anchors, or to anchored mooring buoys, or to ride with both anchors down defines（）.

A.To moor

B.to berth

C.to anchor

D.to ride at anchor