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问题
单项选择题
已加工表面出现硬化的主要原因是（）
A、弹性变形
B、塑性变形
C、挤压变形
答案
参考答案：C
补全对话，情景问答
给下列句子找出对应的答语。
( ) 1. Is your hair long?
( ) 2. What do you have?
( ) 3. What does she like to do?
( ) 4. Who is taller, Amy or Lucy?
( ) 5. What are these?
A. Amy is taller.
B. These are glasses.
C. No, it's short.
D. I have a new dress.
E. She likes to watch TV.
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问答题 简答题
水氢氢冷发电机启动前准备工作中有哪些主要试验项目？
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