漫画《提前与滞后》蕴含的寓意是（） ①党和政府应积极履行国家职能，维护人民利益

肺炎球菌肺炎病人如何吸氧

A．高流量面罩吸氧
B．4～6L/分经酒精湿化吸氧
C．2～4L/分鼻导管吸氧
D．1～2L/分持续鼻导管吸氧
E．低流量间歇鼻导管吸氧

Have you ever been to the square             was built last year?

A．which

B．where

C．when

D．what

Our company has been made one of the largest manufacturers in the field of chemical industry.

A．become, in

B．made, in field of

C．became, in the field

D．been made of, in

简述生态因子对生物生长的作用规律。

性能验收试验完毕后，每套合同设备都达到合同规定的各项性能保证指标后，采购方与供货方签订( )。

A．合同设备改进合同书

B．合同设备安装条款

C．合同设备质量保证书

D．合同设备初步验收证书