时标网络计划中以()表示工作的自由时差。
A.实箭线
B.虚箭线
C.波形线
D.直线
参考答案：C
公司持有的本公司股份不得分配利润。 ( )
Would you please keep silent? The weather report ____ and I want to listen.
A．is broadcast
B．is being broadcast
C．has been broadcast
D．had been broadcast
