急性瘤胃臌气的治疗原则是（）。 A.缓泻制酵 B.改善瘤胃内环境 C.排气减压 D.

平行四边形有______组对边平行且______，而梯形只有______组对边平行．

将从属与主导、秘书工作与领导活动划分开来的秘书工作特性是( )

A．政治性

B．辅助性

C．近身性

D．综合性

急性中毒型菌痢疾的临床类型有（）

A.混合型

B.轻型

C.呼吸衰竭型

D.周围循环衰竭型

E.急性发作型

晋升警衔培训实行（）。

A.严格考核原则

B.逢晋必训原则

C.择优录用原则

D.民主公开原则

No senator spoke at the convention unless he or she was a Democrat. No Democrat both spoke at the convention and was a senator.
Which one of the following conclusions can be correctly drawn from the statements above

A．No one but senators spoke at the convention.

B．No Democrat spoke at the convention.

C．Only Democrats spoke at the convention.

D．No senator spoke at the convention.

E．(E) Some Democrat senators spoke at the convention.