问题 多项选择题

某工程双代号时标网络图如下图所示,下列选项中正确的有( )

A.

B.F最早完成时间为第

C.工作A总时差为1天

D.E的自由时差为2天 D.

答案

参考答案:A,D,E

解析: 双代号时标网络图中各工作的时间参数不用计算,可通过直观判断确定。从图中可以看出:工作A后面的波形线为1天,故总时差为1天;工作F最早结束时间为实箭线右端点对应的坐标,第7天;工作G为关键工作,最迟开始时间等于最早开始时间,等于5天。

单项选择题

An Indian anthropologist, Chandra Thapar, made a study of foreign cultures, which had customs similar to (91) of his native land. One culture in (92) fascinated him because it reveres one animal (93) sacred, much as the people in India (94) the cow. The things he discovered might interest you (95) you will be studying India as part of this course.
The tribe Dr. Thapar (96) is called the Asu and is found on the American continent north of the Tamhumara of Mexico. Though it seems to be a (97) developed society of its type, it has an overwhelming (98) with the care and feeding of the rac—an animal much like a bull in size, strength and temperament. In the Asu tribe, it is almost a social (99) to own at least one (100) not more rats. People not possessing at least one are (101) in low esteem by the community because they are too poor to (102) one of these beasts properly. Some members of the tribe, to (103) their wealth and social prestige, even own (104) of racs.
(105) the rac breed is not very healthy and usually does not live more than five to seven years. Each family invests large (106) of money each year to keep its rac healthy and shod, for it has a tendency to throw its shoes often. There are rac (107) in each community, perhaps more than one if the community is particularly (108) . These specialists, however, due to the long period of ritual training they must undergo and (109) the difficulty of obtaining the right selection of charms to treat the rac, demand (110) offerings whenever a family must treat an ailing rac.

A.own

B.possess

C.protect

D.maintain

单项选择题