A:As sad it i
B:It is as sad
C:Sad as it i
D:Sad as is it
参考数据: 3=1.732 ,sin15°≈0.2588,sin7.5°≈0.1305.
家庭轿车的大量使用,可能引发的环境问题是( )
sin60°的值等于()