计算题:已知直线AB的磁方位角为312°30′,磁偏角为-1°45′,求其真方位角,将它换算成真象限角。(另作图表示)。
参考答案:
A=310°45′,R=49°15′NW
The professor stressed the new medicine would _______ shorten the treatment period from the current days to a minimum of four days.
A.alternatively
B.effectively
C.actively
D.negatively
安息香来源于植物的()。