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请注意答案的单词需要区分大小写!1. The most difficult thing 1)________ is Mandarin Chinese. I did it in evening classes a few years ago and I 2)________ it really, really difficult.2. Probably capoeira, which is a Brazilian dance, martial art, fight thing. It's 3)________ of all these things. And yes, that was very difficult because there were lots of unusual 4)________ to learn.3. 5)________ was the most difficult thing.4. Well, I learned some Sanskrit, and that's got um, 6)________, two more than Latin. It's quite difficult 7)________.5. I think I found 8)________ very hard at school.6. Um, I learned to play the trumpet at school. That was pretty difficult. Er ... and maybe learning to drive. I 9)_______ learning to drive.

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行列式的定义中列指标的排列偶排列时该单项式为正,奇排列时为负。

A. 对
B. 错

请注意答案单词需要区分大小写!I have a full-time job but I like learning 1)________ in my spare time. 2)________, I'm studying Spanish. I'm enjoying it but I'm finding it 3)________. Today we're asking people about learning new things.

主要用于薄板材料及材料表层的硬度测定方法是( )

A. 布氏硬度
B. 洛氏硬度
C. 维氏硬度
D. 里氏硬度

洛氏硬度中的符号HRC所用的测头是()

A. Φ1.588mm钢球
B. 120°金刚石圆锥
C. 140°金刚石圆锥
D. 136°金刚石圆锥

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