冷高压一般形成于________Cold high is generally formed in
A. 寒冷的中高纬度地区 Cold mid-high latitudes
B. 温暖的中高纬度地区 Warm mid-high latitudes
C. 热带地区 Tropics
D. 赤道地区 Equator
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测者眼高为9m，物标高程为25m，则测者能见地平距离为________n mile。If height of the eye is 9m and the height of a landmark is 25m, the distance from the observer to the sensible horizon is___
A. 6.27
B. 10.45
C. 16.72
D. 17.67
航海上1海里的定义是________。 In navigation, the definition of one nautical mile is______
A. 1852m
B. 地球圆球体上纬度1＇的子午弧长 the length of the meridian arc at latitude 1 'on the globle earth
C. 地球椭圆体上球心角1＇所对应的子午弧长 the meridian arc length of the earth's ellipsoid corresponding to the spherical center angle 1 '
D. 地球椭圆子午线上纬度1＇所对应的弧长 The arc length corresponding to latitude 1 'of the meridian on the elliptic earth
关于海里的说法，下列哪个是错误的________ 。Which one is fault about nautical miles?
A. 地球椭圆子午线上纬度1＇的弧长 one minute of arc on elliptic earth meridian
B. 1海里的实际长度随纬度的变化而变化 the actual length of one mile varies with latitude
C. 我国和国际上大多数国家都将1852m定为1海里的标准长度 ur country and most countries in the word make the standard length of one mile as 1852m
D. 将1852m定为1海里的标准长度后，在纬度45°附近产生的误差最大 after made the standard length of one mile as 1852m, the maximum error happens near latitude 45 °
1n mile的实际长度________。The actual length of 1 nautical mile (nm) is____________ .
A. 在赤道附近最短 shortest near the equator
B. 在纬度45°附近最短 shortest near the 45°N or 45°S
C. 在两极附近最短 shortest at poles
D. 固定不变 constant as usual
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