问题
单项选择题
在工程网络图中，M工作的最早开始时间为第12天，持续时间为5天，该工作有三项紧后工作，它们最早开始时间分别为第18天、第19天、第20天，则M工作的自由时差为（）天。
A．4
B．3
C．2
D．1
答案
参考答案：D
解析：
自由时差＝min {18, 19, 20}-(12+5)=1(天)
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在工程网络图中，M工作的最早开始时间为第12天，持续时间为5天，该工作有三项紧后工作，它们最早开始时间分别为第18天、第19天、第20天，则M工作的自由时差为（）天。
A．4
B．3
C．2
D．1
参考答案：D
解析：
自由时差＝min {18, 19, 20}-(12+5)=1(天)
Why do I want to go to college? No one has ever asked me _____ a question. But many times I have asked myself. I have___ _ many ideas. _______ important idea is that I want to be a better man. Many things make human beings different _______ or better than or even superior (优越于)to animals. One of the most important things is ______. If I fail to receive higher education, my education_____. As I want to be a fully _______ man, I must get a well-rounded education, which good colleges and universities are supposed to_________. I know one can get educated in many ways, but colleges and universities are ______ the best places to teach me how to educate myself. Only when I am well-educated, will I be a better man and __ _ _ serve the people.
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