流行性腮腺炎合并睾丸炎时，不可用_________做局部冷敷。
参考答案：冰袋
Having arrived at the station, _____.
A．it was found that the train had left
B．the train had left
C．the train was found left
D．he found that the train had left
函数f（x）=x3-3x2的单调递减区间为（ ）
A．（-∞，0）
B．（0，2）
C．（2，+∞）
D．（-∞，0）∪（2，+∞）
