Americans who consider themselves ________in the traditional sense do not usually hesitate to heap criticism in domestic matters over what they believe is oppressive or wasteful.

A．pedestrian

B．penchant

C．patriotic

D．patriarch

水泥混凝土的设计坍落度指的是（）时对混凝土和易性的要求。

A.拌合时

B.拌合后

C.入模时

D.入模后