— Nice to meet you!
— _______
A:Thank you!
B:How do you do?
C:Nice to meet you, too!
D:The same to you!
写反义词。
沉重—____ 宽容—____ 平静—____ 鼓励—____
若a>b,c>d,则下列命题中正确的是( )
已知sinπ+αcos-α+4πcosα=12,求cos(π2+α)值.