A vessel constrained by her draft shall, when she overtakes a sailing vessel in a fairway,the sailing vessel is（）.

A.priviledged vessel and keep her course and speed

B.burdened vessel and give way to others

C.burdened vessel and keep course nad speed

D.priviledged vessel and give way to others

循环水泵的工作特点是()。

A.流量大、扬程低；

B.流量大、扬程大；

C.流量小、扬程小；

D.扬程大、流量小。