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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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
在航海上，在对方向精度要求不高，如表示风流方向时，一般用_______。 In navigation, it is usually to give the direction of winds and current in general by_______
A. 半圆周法 semicircle direction
B. 圆周法 circle direction
C. 罗经点法 compass point direction
D. 四点方位法 four points bearing
航海上划分方向的方法中最常用的是：________which method is the most usual to give direction in navigation？
A. 半圆周法 semicircle direction
B. 圆周法 circle direction
C. 罗经点法 compass point direction
D. 四点方位法 four points bearing
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