砌体基础中的洞口超过( )mm时,应砌筑平拱或设置过梁。
A.150
B.200
C.300
D.400
参考答案:C
根据句意和首字母提示填空。
1. Some c________ are playing games in front of the house.
2. Eric usually w________ TV after work.
3. Joe likes r________ in the park every morning.
4. Don't l________ at your pictures, listen to the teacher, Jim!
5. We have great fun v________ Dalian.
老年人闭合气量增加,全麻下可适当采取()
A.加大潮气量
B.提高吸入气氧浓度
C.呼气末正压
D.提高呼吸频率
E.延长吸气时间