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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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
关于水流，以下正确的是________。which one is correct about the direction of the current?
A. 流向是指流的来向 the direction of the current is where it comes from
B. 流向是指流的去向 the direction of the current is where it goes
C. 流向等于有时候是来向，有时候是去向，有使用者确定。the direction of the current is depended on the user
D. 以上对不对。 all above are false
关于风向，以下正确的是________ 。which one is correct about direction of winds?
A. 风向是指风的来向 the direction of the wind is where it comes
B. 风向是指风的去向 the direction of the wind is where it goes
C. 风向等于有时候是来向，有时候是去向，有使用者确定。the direction of the wind is depended on the user
D. 以上对不对。all above are false
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