Mariners not entering the port are________to keep at least one mile off.

A.advised

B.reported

C.complied

D.supplied

When considering a vessel&39;s stability，which spaces in a general cargo vessel are the best locations for the carriage of bulk grain?

A.Deep tanks

B.Lower holds

C.Lower holds at the ends of the vessel

D.Tween-decks

What is LEAST likely to cause ignition of fuel vapors ________．

A.Static electricity

B.An open running electric motor

C.Loose wiring

D.Explosion proof lights

衡量船轴磨损的指标是______和______。

A.磨损量/磨损率

B.圆度/磨损量

C.圆度/圆柱度

D.圆柱度/磨损率

下列关于灰体的说法，错误的是______。

A.极少数的工程材料在热射线范围内才可以近似看作灰体

B.灰体对各种波长的投射表现出同样吸收率

C.只有在温度相等的热平衡条件下，灰体的的吸收率恒等于它的黑度

D.灰体的辐射力越大，它的吸收率越大

用吸附法制取氮气其含氧量可达( )。

A.0.5%

B.4%

C.4ppm

A、Ⅰ+Ⅱ

B、Ⅰ+Ⅲ

C、Ⅱ+Ⅲ

D、Ⅰ+Ⅱ+Ⅲ