Thank you for me about your day.[ ]
A. tell
B. telling
C. tells
答案:B
用计算器求下 * * 角函数(保留四位小数):sin38 °19′=( );cos78 °43′16〞=( );tan57 °26′=( )
A.mgtgθ
B.mgsinθ
C.μmg
D.μmg