XIF pit
Publish: 2021-04-20 17:10:10
1. The conical seed bottle is a sharp top inverted conical bottle, which is similar to the chicken heart (also known as the chicken heart bottle). Because it is inverted conical, the observation surface is larger than the dome shape when storing samples. It seems that the instrument can not be found. 3. The specimen bottle or the specimen jar is a cylindrical, rectangular or square glass jar, and the edge of the jar is ground flat
2. Hello, after 2005. I'm glad to answer for you If there is a problem with the car, ask the car master. 4S shop professional technician, 10 minutes to solve
3. The vernacular word "Xiang" means that the language is not easy to explain. In the vernacular, this word is a special word, so many people are not clear about it
4. Wrong< br />\ X means that the following characters are hexadecimal numbers, which can only be 0-9 and A-F or A-F! Because I'm out of this range, it's not right
5. I充分性：若a2+b2=0时，即a=b=0，所以fx=x|x|．∵f-x=-x|-x|=-x|x|=-fx，对一切x∈R恒成立，∴fx是奇函数
必要性：若fx是奇函数，则对一切x∈R，f-x=-fx恒成立，即-x|-x-a|+b=-x|x-a|-b．
令x=0，得b=-b，所以b=0．
再令x=a，得2a|a|=0，∴a=0，即a2+b2=0．
II∵b＜2
必要性：若fx是奇函数，则对一切x∈R，f-x=-fx恒成立，即-x|-x-a|+b=-x|x-a|-b．
令x=0，得b=-b，所以b=0．
再令x=a，得2a|a|=0，∴a=0，即a2+b2=0．
II∵b＜2
6. Unknown_Error
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