单项选择题
A.a high-pressure area B.pressure difference over horizontal distance C.pressure difference over time D.vertical pressure variation
On what does the operation of an aneroid barometer depe...
单项选择题On what does the operation of an aneroid barometer depend?（）
A.Thin，metal，air tight cell B.Curved tube containing alcohol C.Column of mercury supported by atmospheric pressure D.Expansion of mercury in a closed tube
MODERATE WAVES，TAKING A MORE PRONOUNCED LONG FORM；MANY ...
单项选择题MODERATE WAVES，TAKING A MORE PRONOUNCED LONG FORM；MANY WHITE HORSES ARE FORMED.THIS sea condition is likely to be termed（）.
A.moderate breeze B.fresh breeze C.strong breeze D.near gale
In the Northern Hemisphere，winds veering sharply to the...
单项选择题In the Northern Hemisphere，winds veering sharply to the west or northwest with increasing speed are indications that a（）.
A.cold front has passed B.low pressure center is approaching C.stationary front exists D.high pressure center has passed
