某分部工程双代号时标网络计划如图2-2所示，其中工作A的总时差和自由时差（）。
A．分别为1和0
B．均为1
C．分别为2和0
D．均为0
参考答案：A
Please come ______ see ______ yourself at Huaxing Clothes Store.
A．to; about
B．at; for
C．and; for
D．to; at
______: A graphical bar with buttons that perform some of the most common commands.
A．Title bar
B．Tool bar
C．Status bar
D．Scroll bar
