什么是热敏电阻？
参考答案：
电阻阻值随环境温度规律变化而变化的电阻叫热敏电阻。
传染过程的五种表现一般说来，哪种表现出现最多
A．病原体被消除
B．病原携带状态
C．隐性感染
D．潜伏性感染
E．显性感染
对画线部分提问。
1. His telephone number is 9288288.
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2. The American teachers have taught in our school for ten years.
3. Many people now keep in touch with each other by e-mail of QQ.
