下载APP
举一反三
【多选题】A．工作1-2为关键工作 B．工作1-3的总时差为1 C．工作3-5为关键工作 D．工作4-7的总时差为0 E．工作5-7的总时差为0
A.
某工程双代号网络计划如下图所示，图中已标出每个节点的最早时间和最迟时间，该计划表明（）。
B.
【单选题】In the beginning, your kids need you—a lot. They’re attached to your hip, all the time. It might be a month. It might be five years. Then suddenly yon are expected to send them off to school for seven...
A.
includes frequent physical contact with children
B.
means mutual responses to children’ happiness
C.
can lead to the lack of sense of security
D.
is not popular among urban parents