current life table

进流（ingression current）

The current flowing first in one direction and then in another is called_____ current.

A:an alternating B:a rush C:a direct D:an exciting

Possible phase relationships between voltage and current in an alternating current circuit include which of the following conditions?

A:Current and voltage may be in phase B:Current may lead the voltage C:Current may lag the voltage D:All of the above

When the current in a power transmission line is increased, the power loss _____.

A:increases as the square of the current B:decreases as the square root of the current C:remains the same, as it is independent of current flow D:increases in direct proportion as the current

"If the corrections be stuck in the parent book or current supplement, ______．

A:when a new supplement is received, those corrections issued after the date of the newsupplement must be retained B:the parent book must be consulted C:the current supplement must be consulted D:the Annual Summary of Notice to Mariners must be used

"Tidal current is ______．

A:horizontal movement of water B:the vertical rise of the water C:the vertical fall of the water D:the amount and time of the tide"

On an Atlantic Ocean voyage from New York to Durban，South Africa ，you should expect the Agulhas Current to present a strong _____．

A:offshore set B:onshore set C:head current D:fair or following current"

The set of the ocean current is caused by ______．

A:density differences of the water B:rotation of the earth C:direction of primary circulation of air D:all of the above"

The set of the ocean current is caused by ______.

A:density differences of the water B:rotation of the earth C:direction of primary circulation of air D:all of the above"