题目：
在工程网络计划中，M工作的最早开始时间为第16d，其持续时间为4d，该工作有三项紧后工作，它们的最早开始时间分别为第22d、第23d、第25d，则M工作的自由时差为 ( ) d。
A．4
B．5
C．3
D．2
答案：
参考答案：D
在工程网络计划中，M工作的最早开始时间为第16d，其持续时间为4d，该工作有三项紧后
来源：www.tikuol.com
题型：单项选择题
试题推荐
题型：问答题
简述教师的职业道德和职业情感。
题型：问答题
请在“答题”菜单下选择“汉字录入”命令，启动汉字录入测试程序，按照题目上的内容输入汉字：
神舟五号、神舟六号飞船的成功，在某种程度上告诉世界：中国，不是—个只能生产鞋子、袜子、打火机的国家，她还有实力制造宇宙飞船。在神舟飞船的研制中，中国依靠的完全是自己的技术、自己的制造业。神舟的成功，可以增强国际上对中国技术和产品的信赖，“中国制造”在世界上的底气将会变得更足。
题型：阅读理解
| 任务型阅读 | |
| In the past 100 years Asian Americans have become the fastestgrowing US minority.As their children began moving up through the nation's schools,it became clear that a new class of academic achievers was forming.Their achievements are reflected in the nation's best universities,where mathematics,science and engineering departments have taken on an Asian character. This special liking for mathematics is partly explained by the fact that AsianAmerican students who began their education abroad arrived in the US with a solid grounding in mathematics but little or no knowledge of English.They are also influenced by the promise of a good job after college.Asians feel there will be less unfair treatment in areas like mathematics and science because they will be judged more objectively.And the return on the investment (投资) in education is more immediate in something like engineering than that with an arts degree. Most AsianAmerican students owe their success to the influence of parents who are determined that their children take full advantage of what the American educational system has to offer. An effective measure of parental attention is homework. Asian parents spend more time with their children than American parents do,and it helps.Many researchers also believe there is something in Asian culture that promotes success,such as ideals that stress family values and education. | |
Topic | In the past 1.________,Asian Americans have made great academic achievements,making them the fastgrowing US 2.________. |
Reflection of achievements | AsianAmerican students 3.________more in mathematics,science and engineering. |
| 4.________for their achievements | Having a solid foundation in mathematics； |
| Expecting a good job after 5.________； | |
| Receiving fairer treatment from more objective 6.________； | |
| Realizing investment more 7.________； | |
| Encouraged to make full 8.________of American educational system； | |
| Performing well especially in homework with the 9.________of parents； | |
| Living up to the ideals deeply 10.________in Asian culture. | |
题型：判断题
制冷装置中贮液器可以完全装满液态冷剂。
题型：填空题
稠化机油有（）三个优点。
