不可用于六层以下建筑物承重墙体砌筑的墙体材料是（）。
A.烧结黏土多孔砖
B.烧结黏土空心砖
C.烧结页岩多孔砖
D.烧结煤矸石多孔砖
参考答案：B
The current price of XYZ Inc. is $40 per share with 1000 shares of equity outstanding. Sales are $ 4000 and the book value of the firm is $ 10000. What is the price/sales ratio of XYZ Inc.（）
A. 0.010.
B. 10.000.
C. 4.000.
植物地理学
