层板复合材料主要是指由颗料增强的复合材料。
参考答案:错
已知命题p:∀x∈R,sinx≤1,则¬p为______.
—I’m sorry to keep you waiting for me so long.
—_______
A.I don’t think so.
B.Don’t say so.
C.It doesn’t matter.
D.I’d love to.