引起中心静脉压升高的因素有()
A.由直立位改为平卧位
B.骨骼肌的活动减少
C.容量血管收缩
D.输血或输液过多、过快
E.右心室射血功能减弱
参考答案:C, D, E
句型转换。
1. They have a baseball. (改为一般疑问句)
_________ _________ a baseball?
2. Lily has a computer. (改为否定句)
Lily _________ _________ a computer.
3. Does Mary have 4 baseballs? (作否定回答)
No,_________ _________.
4. Her father watches TV every day. (改为否定句)
Her father _________ _________ TV every day.
5. They have some balls. (改为单数句子)
_________ _________ _________ ball.
6. This story is boring. (改为同义句)
This story_________ _________.
“公众气象服务”要贯彻什么服务理念?