某年某地130名健康成年男子脉搏 (次/分)的频数分布如下:
上述表格中的资料属于()。
A.二项分类资料
B.无序分类资料
C.半定量资料
D.等级资料
E.数值变量资料
参考答案:E
读句子,选出正确的单词填空(只填序号)。
1. — Here _____________ (A. you B. your) are. — Thank you.
2. I _____________ (A. has B. have) a rabbit.
3. What's _____________ (A. your B. you) name?
4. How _____________ (A. is B. are) you?
5. This _____________ (A. is B. are) Sarah.
正馈线带电部分距接地体的最小极限距离是:()。
A、240mm
B、300mm
C、330mm
D、350mm