When the density of water is 1000,i.e.in fresh water and in summer zone a ship may load to the upper edge of the line marked（）...

第1题

[单选题] When is the density of the water required to be logged in the logbook of a ship?（）

A、Any time the vessel moves from water of one density into waters of a different density B、Prior to getting underway when the vessel is floating in fresh or brackish water C、Only when the vessel moves from fresh water into salt water D、The density of the water is not required to be logged in the unofficial logbook

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第2题

[单选题] One of the causes of ocean currents is density differences in the water. This is true because （）.

A、in an area of high density the water's surface is lower than in an area of low density B、surface water flows from an area of high density to one of low density C、the lesser the density gradient the freer the water is to move D、it is the density differences that cause the currents to stay in the troughs

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第3题

[单选题] A current will develop between areas of different density in ocean waters. If you face in the same direction the current is flowing，the water of（）.

A、high density will be on the left in the Northern Hemisphere B、high density will be on the right in the Southern Hemisphere C、low density will be on the left in the Northern Hemisphere D、low density will be on the left in the Southern Hemisphere

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第4题

[单选题] An after-cooler installed between the turbocharger and the cylinder air inlet （）

A、increases the density of the air B、decrease the density of the air C、increases the specific heat of the air D、decreases the specific heat of the exhaust