在奴隶社会和封建社会中执行警察职能的机构与官吏，称为古代警察。 ( )
参考答案：对
As the visiting prime minister puts, China’s influence in the world will continue to strengthen ______ its economy grows.
A．although
B．until
C．as
D．before
水磨石的抗折强度，平均值不得低于（）MPa.
A.8
B.7
C.6
D.5
