题目内容
1.对于装配体中没有完全固定的零部件，为使零部件到一个更好的位置上，方便建立配合关系，我们可以移动和旋转零部件。
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2.在装配体环境中不能对零部件进行编辑修改
[音频]Sally: Hi, Leo. (1) .Leo:I can't, Sally. I've(2).Sally:How did that happen?Leo:I tripped on the stairs—they were slippery because my mom had just washed them.Sally:Oh no! (3)?Leo:Well, the doctor told me I needed to RICE.Sally:You need to eat rice? How would that help?Leo:Not eat rice! R-I-C-E. It stands for rest, ice, compression and elevation.Sally:I see! (4)?Leo:That's right—and my feet up on lots of cushions!Sally:It sounds a bit boring. Why don't I come over to your place? I can bring some ice cream, that is.Leo:Yes, please!(Note:RICE是首字母缩略词，每个字母代表一个不同的词。其中，R代表rest，I代表ice，C代表compression，E代表elevation。首字母缩略词主要由短语或单词的第一个字母组成，可帮助人们记忆。例如：the Belt and Road Initiative，缩写为B&R，指“一带一路”倡议。首字母缩略词也常用于组织的名称，例如：WHO是World Health Organization 的缩写，指世界卫生组织。)
周期函数的定义域是无限区间
奇函数在x=0处的函数值一定为0
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