单项选择题

碳达峰是指二氧化碳排放总量在某一个时间点达到（），之后碳排放总量会逐渐稳步回落。

A.历史峰值
B.全球减排一半
C.没有温室气体排放
D.相对“零排放”

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单项选择题

Which one of the following statements is correct？

A．An increase in an asset is a debit and an increase in an expense is a credit
B．An increase in capital is a debit and an increase in a liability is a credit
C．An increase in an expense is a debit and a reduction in an asset is a credit
D．A reduction in a liability is a debit and an increase in an expense is a credit

如果外延速率偏低，只要增大外延气体中硅源（如SiCl4）浓度，硅的气相外延速率就会增加。

答案：错误