题目内容

饱和烷烃类有机化合物在质谱图上最常见的基峰是（)

A. m/z 15
B. m/z 29
C. m/z 43
D. m/z 71

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平面曲线y = f(x)水平渐近线的条数至多是

A. 无数条
B. 1
C. 2
D. 3

平面曲线y = f(x)垂直渐近线的条数至多是

A. 无数条
B. 1
C. 2
D. 3

Zhuge Liang was born during the ① Period. He was a famous statesman, ____ ②.

In 207, Liu Bei paid three visits to the __________________ ③ of Zhuge Liang.