问题
选择题
As far as I know, shopping online has many advantages, ________the most important one is convenience.[ ]
A. during which
B. of them
C. of which
D. of whom
答案
答案：C
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As far as I know, shopping online has many advantages, ________the most important one is convenience.[ ]
A. during which
B. of them
C. of which
D. of whom
答案：C
在上题所示双代号网络计划中，如果计划工期等于计算工期，则各项工作自由时差的正确值应为（）组。
| 组别 | 工作A | 工作B | 工作C | 工作D | 工作E | 工作F |
| A | 0 | 0 | 0 | 0 | 0 | 0 |
| B | 0 | 0 | 1 | 1 | 0 | 0 |
| C | 0 | 0 | 1 | 2 | 0 | 0 |
| D | 0 | 1 | 0 | 2 | 1 | 0 |
A.A
B.B
C.C
D.D
E.E
F.F