问题 单项选择题

某项目主要由A~I任务构成,其计划图(如下图所示)展示了各任务之间的前后关系以及每个任务的工期(单位:天),该项目的关键路径是(1)。在不延误项目总工期的情况下,任务A最多可以推迟开始的时间是(2)天。

(1)处是()

A.A→G→I

B.A→D→F→H→I

C.B→E→G→I

D.C→F→H→I

答案

参考答案:C

解析:

关键路径是时间最长的那条路径,B→E→G→I这条路径耗时最长,总共2+5+6+7=20天。经过任务A的时间最长路径是A→D→F→H→I,总共2+4+1+4+7=18天。只要A的延误时间不超过20-18=2天,就不会对整体时间产生影响。

单项选择题
单项选择题

Recently, I flew to Las Vegas to attend a meeting. As we were about to arrive, the pilot announced with apology that there would be a slight (16) before setting down. High desert winds had (17) the airport to close all but one runway. He said that we would be (18) the city for a few minutes waiting to (19) . We were also told to remain in our seats meanwhile with our seat belts fastened (20) there might be a few bumps(颠簸). Well, that few minutes turned into about four-five minutes, including a ride that would make a roller coaster(过山车) (21) by comparison. The movement was so fierce that several passengers felt (22) and had to use airsickness bags. As you might guess, that’ s not a good thing to have happen in a(n) (23) space because it only (24) to increase the discomfort of the situation.

About twenty minutes into the adventure, the entire airplane became very (25) There was now a sense of anxiety and fear that could be (26) noticed. Every passenger simply held on for dear life …except one. A (27) was having a good time! With each bump of the (28) , he would let out a giggle (咯咯地笑)of delight. As I observed this, I (29) that he didn’t know he was supposed to be afraid and worried about his (30) . He neither thought about the past nor about the future. Those are what we gown--ups have learned from (31) . He was (32) the ride because he had not yet been taught to fear it. Having understood this, I took a deep breath and (33) back into my seat, pretending I was (34) on a roller coaster. I smiled for the rest of the flight. I even (35) to giggle once or twice, much to the chagrin(随恼) of the man sitting next to me holding the airsickness bag.

31()

A.pilot 

B.baby 

C.guard 

D.man