酸碱物质有几级电离，就有几个突跃。( )
参考答案：错
During activity sequencing, you identify and document interactivity dependencies. All the following are outputs from activity sequencing process EXCEPT（）
A. project schedule network diagrams
B. activity attribute updates
C. requested changes
D. milestone list
乙肝病毒是（）。
A．杯状病毒
B．嗜肝DNA病毒
C．缺陷病毒
D．黄病毒
E．微小RNA病毒
