在机械通时，尽量使用较低的（）及（），较低吸入（）以达到可允许的血气结果。
参考答案：通气压力；潮气量；氧浓度
下列各句中均有一处错误,请找出并改正.
( )1. That's wasteful to throw away waste paper.
A B C D
( )2. Both Tony and Sam has been to the Great Wall.
( )3. Everyone in the green school do something to help protect the environment.
( )4. Those small factories cause too many pollution every day.
( )5. We should do our best to stop the factories from pollute the air.
建立计算机网络的主要目的是实现计算机资源的共享。计算机资源主要指计算机______。
A．软件与数据库 B．服务器、工作站与软件C．硬件、软件与数据 D．通信子网与资源子网
