下列哪些是影响瓦斯涌出量因素.（）。
A.煤层瓦斯含量
B.大气压力的变化
C.开采程序
D.开采规模
参考答案：A, B, C, D
---Who’s that speaking?
--- .
A．I’m Lily.
B．She is Lily.
C．I’m Lily speaking.
D．This is Lily speaking.
______ is one of the techniques used for estimating activity durations.
A．Analogous Estimating
B．Precedence Diagramming Method (PDM)
C．Dependency Determination
D．Schedule network Templates
