问题
选择题
—It was quite a heavy snow last night. Is everyone here now?
—Yes, and _______ of us was late for school this morning.[ ]
A. neither
B. either
C. all
D. none
答案
答案：D
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—It was quite a heavy snow last night. Is everyone here now?
—Yes, and _______ of us was late for school this morning.[ ]
A. neither
B. either
C. all
D. none
答案：D
根据表中给出的逻辑关系绘制的双代号网络图如下所示：
| 工作名称 | A | B | C | D | E | F |
| 紧前工作 | - | - | A、B | A、B | B | C、D、E |
若在双代号网络计划中，某工作的最早开始时间为第6天，其持续时间为5天，其紧后工作的最早开始时间和最迟开始时间分别为第14天和第16天，则该工作的自由时差为 ( )天。