∠α的补角是120°,则∠α=______,sinα=______.
60°,
根据补角定义,∠α=180°-120°=60°,于是sinα=sin60°=.
故答案为60°,
The traffic policeman _____ the cars to run _____ at the crossing. [ ]
A. directed; to the right direction
B. showed; towards the right direction
C. showed; in the right direction
D. directed; in the right direction
酸类化学烧伤后,急救处理是()
A.碱性液冲洗
B.中和剂冲洗
C.清水冲洗
D.消毒液
E.酒精冲洗