挖掘机正铲作业时,最大开挖高度和深度不超过机械本身性能的规定;反铲作业时,履带距工作面边缘距离应大于()m。
A.3
B.2.5
C.2
D.1.5
E.1
参考答案:D
写出开车前建立蒸汽管网的步骤要点?
Estimating activity durations uses information on activity scope of (74) , required resource types, estimated resource quantities, and resource calendars.
A.milestone
B.work
C.quality
D.baseline