影响C曲线形状和位置的因素有哪些?
参考答案:
影响C曲线形状和位置的因素有:(1)含碳量;(2)合金元素及其含量;(3)加热温度和保温时间。
Read and judge. 读后请认真判断各题,正确的在括号内写“T”,错误的写“F”。
Wu: Hi. What is the matter?
Amy: I can't find my classmates.
Wu: Don't worry. Let me help you.
Amy: Thank you. Do you see any classmates?
Wu: Yes.
Amy: Where are they?
Wu: They are in the woods.
Amy: Are they catching butterflies?
Wu: No. They aren't.
Amy: Are they picking up leaves?
Wu: Yes, they are.
Amy: Let's go and see.
Wu: OK.
( )1. Amy's classmates are in the woods.
( )2. Amy's classmates are catching butterflies.
( )3. Amy's classmates are picking up leaves.
当发生故障时,切除故障的时间()。