和冷高压前部相比，下列符合冷高压中部天气特征的有________Compared with the front of cold high, which one is consistent with the central weather characteristic?
A. 气温回升 The temperature rises
B. 气温急剧下降 The temperature drops sharply
C. 气压急剧增加 The pressure increases sharply
D. 引起大风 strong wind
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冷高压一般________比较频繁 The frequent occurrence of Cold high is
A. 春季 Spring
B. 夏季 Summer
C. 秋季 Autumn
D. 冬季 Winter
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
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
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