网络维护的基本内容有哪些?
参考答案:
测试网络、网页的日常维护、网站的宣传推广、网站的优化与更新、网站的备份与恢复。
The number of people in the world ________ about 6 billion and large quantities of waste ________ each year.[ ]
A. totals; has been produced
B. totals; is produced
C. totals; are produced
D. total; are being produced
女性,58岁,因慢性阻塞性肺疾病呼吸衰竭住院,行气管插管机械通气支持。1天后神志已转清,PaCO2由10.6kPa(80mmHg)降至5.1kPa(38mmHg)
本例患者机械呼吸通气量需要调节,主要根据的因素是()
A.PaO2
B.肺静动脉血分流量(Qs/Qt)
C.随访血气了解pH和有无复合性酸碱紊乱
D.患者神志状态
E.肺泡-动脉氧分压差(PA-aO2)