问题
多项选择题
某工程双代号时标网络计划如下图所示（）
A．B的总时差为3天
B．工作G的自由时差为2天
C．D为关键工作
D．时差为2天
答案
参考答案：A, B, C, D
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某工程双代号时标网络计划如下图所示（）
A．B的总时差为3天
B．工作G的自由时差为2天
C．D为关键工作
D．时差为2天
参考答案：A, B, C, D
One day， a Chinese student goes to study English in England. His family name is Sun. It is the _ __ as the word "sun." England is a country with _ . It is often cloudy or misty(多雾的)，and it _ again， so the days there _ _ get much sunshine(阳光) all the year. When the Chinese student gets to London，a tall _ _ policeman with a long face _ __ his passport(护照) to check(检查) it. The policeman finds the Chinese name "sun" in the passport. He _ _ it is pronounced(发音) just like the _ word "sun". So he says to the Chinese student， "I see your name is Sun， you’re wanted here. You bring sunshine __ _ England， so we don’t want you to __ __ ." They smile.
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