单项选择题

The reason I have to go is （） if I don’t.

A.that she will be disappointed
B.because she will be disappointed
C.on account of her being disappointed
D.that she will be disappointing

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The concentration of electrons in the conduction band exceeds the density of states, the Fermi energy lies within the conduction band, it is called [填空1].

答案： 1、degeneraten-type semiconductor

不定项选择

‏内部收益率法的判断准则可分为绝对判断和相对判断，其中相对判断准则：IRR最大法成立

A．正确
B．错误