为使厨房吊顶耐火和不变形,常选用的理想吊顶面层材料是( )。
A.石膏板
B.PVC板
C.矿棉板
D.铝合金板
参考答案:D
We couldn't see _____ because the light in the room was poor. [ ]
A. enough clear
B. clear enough
C. enough clearly
D. clearly enough
先后掷两个均匀正方体骰子(六个面分别标有点数1,2,3,4,5,6),骰子朝上的面的点数分别为X,Y,则log2XY=1的概率为多少?