An air mass is termed warm if（）.

A、it is above 70°F

B、the ground over which it moves is cooler than the air

C、it originated in a high pressure area

D、it originated in a low pressure area

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更多“An air mass is termed warm if（）.”相关的问题

第1题

[单选题] A frontal thunderstorm is caused by（）.

A、pronounced local heating B、wind being pushed up a mountain C、a warm air mass rising over a cold air mass D、an increased lapse rate caused by advection of warm surface air

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第2题

[] Temperature and moisture characteristics are modified in a warm or cold air mass due to （）.

A、A.pressure changes in the air mass B、B.movement of the air mass C、C.the heterogeneous nature of the air mass D、D.upper level atmospheric changes

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第3题

[] （） is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.

A、A.An air receiver B、B.An operating valve C、C.An automatic valve D、D.An air distributor

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第4题

[单选题] A warm air mass is characterized by（）.

A、stability B、instability C、gusty winds D、good visibility

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第5题

[单选题] Increased air （） will raise scavenge efficiency and allow a greater mass of air to be compressed； more fuel may now be burned giving an increased power.

A、specific volume B、density C、viscosity D、calorific value