问题
单项选择题
某工程时标网络图如下所示，下列选项正确的是（）。
A．工作C的TF为2
B．工作I的FF为3
C．工作D的FF为3
D．工作G的FF为1
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
某工程时标网络图如下所示，下列选项正确的是（）。
A．工作C的TF为2
B．工作I的FF为3
C．工作D的FF为3
D．工作G的FF为1
参考答案：D
Air is all round us．It is around us___31____we walk and play．From the time we are born，air is around us on every side．When we sit down，it is around us．When we go to bed．air is 32 around us．We live 33 air． All living things 34 air．Living things cannot live 35 air．We can live without any water for 36 days，but we cannot live for more 37 a few minutes without air．When we are working 38 running，we need more air．When we are asleep，we need less air We live in air but we cannot see it．We can only feel it．We can feel it when it is 39 ． Moving air 40 wind．
|