抗滑表层石料的抗滑性能至关重要,规范附录C表8增补了磨光值、冲击值等指标。其中()是必须进行的指标。
A.磨光值
B.冲击值
C.压碎值
D.磨光值和冲击值
参考答案:A
论述司空图韵味说的艺术原则。
_______is our belief that improvements in health care will lead to a stronger, more prosperous economy. [ ]
A. As
B. That
C. This
D. It