排水设施和砌石护坡用石料，可采用块石，其饱和抗压强度不小于( )MPa。
A．30～50
B．30～60
C．40～50
D．10～30
参考答案：C
40. —Good evening. Huangshan Hotel.
—Good evening. ______________?
A．Do you still have a room for tonight
B．What would you like, please
C．Is there anything I can do for you
D．Who is that speaking, please
疗疮脓尽外治用（）
A.生肌散
B.玉露散
C.九一丹
D.八二丹
E.白玉膏
______________?