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问题
单项选择题
呼吸机使用过程中参数调整时降低PaCO可以实现（）
A.提高潮气量
B.提高氧浓度
C.合理运用PEEP
D.延长吸气时间
E.缩短呼气时间
答案
参考答案：
E
解答题
计算
(
5
+2
)
2
-(
5
-2
)
2
．
查看答案
选择题
By the time I got to the train station, the train _______ for ten minutes. I had to wait for the next one.
A. has left
B. has been away
C. had left
D. had been away
查看答案
