导致PETCO2异常升高的原因不包括（）
A.发热
B.高血压
C.气管导管误入食管
D.呼吸机活瓣失灵
E.钠石灰失效
参考答案：C
He ______ all his money to buy a new bike. [ ]
A. saved
B. spent
C. made
D. earned
如何开展中央空调水质处理工作？
