问题
单项选择题
在工程网络图中，工作的最迟完成时间为第20天，其持续时间为6天，该工作有三项紧前工作，它们的最早完成时间分别为第8天、第10天、第12天，则工作的总时差为( )天。
A．8
B．6
C．4
D．2
答案
参考答案：B
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在工程网络图中，工作的最迟完成时间为第20天，其持续时间为6天，该工作有三项紧前工作，它们的最早完成时间分别为第8天、第10天、第12天，则工作的总时差为( )天。
A．8
B．6
C．4
D．2
参考答案：B
根据短文内容，从短文后的选项中选出能填入空白处得最佳选项。选项中有两项为多余选项。（每题1分，共5分） 小题1: One of the best things you possibly do is start your own club. It’s great fun especially if you are the sort of person who feels there’s never anything to do during the school holidays. The first thing you need to come up with is an idea for your club. 小题2:___ Pets, clothes, pop music or dancing groups, sports, masking things… The lost is endless. Next you need some friends to be in your club with you.小题3: __ All you need is three or four other people who are interested in the same thing as you. 小题4: __ You should all sit down somewhere together with lots of pieces of paper and write down every name you can think up. That’ll keep you busy for ages. At your first meeting you should make up a rule book. And the first rule should be no grown-ups or little/big brothers or sisters! The best clubs are always secret! Now you have just about everything you need, except membership cards. These are very important and again you can spend a lot of time making them. 小题5: . Why not leave some space for a photo of yourself? That will make the membership card really look like it. So there you are, get clubbing! Once you get started you’ll think of loads of more interesting things to do!
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