单代号网络计划的节点符号可以表示( )。
A.工作时间
B.工序代号
C.工序代号与工作时间
D.均不表示
参考答案:C
下列各组数中,数值相等的是( )
A.32和23
B.-23和(-2)3
C.-|23|和|-23|
D.-32和(-3)2
— You should have prepared your speech for the meeting, Mr.Smith.
— Yes, I know.But how could I________the meeting date fixed so soon? [ ]
A. while
B. as
C. after
D. with