简述出口退税的意义与作用。

_____ that Mike was sure to be admitted into the art school. [ ]

A. So successful was his performance  

B. So successful his performance

C. So his performance was successful  

D. So was his successful performance

当设计无要求时，控制电缆支架层间最小允许距离为（）mm。

A、120

B、150

C、180

D、200

人民警察的( )，是人民警察依法履行职责、行使职权所应具备的法律意识、法律知识和执法技能的综合体现。

A．业务素质

B．法律素质

C．文化素质

D．政治素质

寒淫证候患者可出现()

A．恶寒无汗

B．手足拘急

C．脘腹冷痛

D．胸闷苔滑

E．身体强直

（）不是社会化的载体。

A．家庭

B．大学

C．杂志

D．意识