长距离输送管道中为减少混油量使用的机械隔离器的直径一般比管内径大（）。A.4%～5%

Li Na is_______ tennis player in China now.

A. most famous       B. the roost famous      C. more famous

A．O₂的消耗速率等于NO的消耗速率

B．容器中存在N₂，O₂，NO三种气体

C．容器内混合物总的物质的量不随时间而改变

D．单位时间内每生成n mol N₂的同时生成2n mol NO

注氨可以调节塔顶冷凝水的pH值。

下列属于党的基层组织的基本任务的是：（）

A.宣传和执行党的路线、方针、政策

B.组织党员认真学习党的先进理论

C.对党员进行教育、管理、监督和服务

D.充分发挥党员和群众的积极性创造性

The well-known Garub Site, unearthed in 1997, shows that man had made living there as early as 5,000 years ago.

A. human had lived


B. humans had lived
C. human being lived


D. human beings lived