影响杀菌效果的因素有哪些？
参考答案：
1）杀菌温度；
2）杀菌时间。
解不等式：2（x-1）＜x+1，并求它的非负整数解．
I've never ______ the theory that people are more important than animals.
A．subscribed to
B．hung on
C．engaged in
D．indulged in
