气压调压器的整定范围应在（）Mpa之间。

A.0.3—0.5

B.0.45—0.6

C.0.6—0.7

D.0.65—0.8

When your vessel is proceeding to the area of traffic density,（）is used to determine the exact ranges of other ships or objects in the vicinity.

A.radar

B.GPS

C.DF

D.satellite navigator