—Could you tell me ________________?

—I don’t know. It seemed to be cool, powerful and confident.

A．why “Carrier Style” is known to all in China

B．when was “Carrier Style” so popular in China

C．where “Carrier Style” is popular

D．how was “Carrier Style” well-known in China

按库仑公式计算挡土墙上的地震主动土压力时，下述不正确的是（）。

A.墙背填土表面按水平考虑

B.公式中的容重γ用γ/cosθ代替

C.土的内摩擦角φ及墙背与土的摩擦角艿δs分别修正为φ-θ和δs+θ

D.地震角应根据基本烈度按浸水与非浸水两种情况查表求得