膨胀机在加温过程中（）是造成膨胀机加温时间过长的原因之一。
A.加温气量过低
B.密封气泄漏
C.加温气温度过高
D.密封气压力过高
参考答案：A
如果a＜0，并且|a|=4，那么a的倒数是（ ）．
—_____.
—I have a headache. [ ]
A. What's the matter, Judy?
B. Where are you, Judy?
C. Who are you?
D. What are you doing, Judy?
