问题
单项选择题
某分部工程双代号网络图如下图所示，图中错误是（）。
A．存在循环回路
B．节点编号有误
C．存在多个起点节点
D．存在多个终点节点
答案
参考答案：C
解析：
该双代号网络图中出现了①与⑥两个起点节点。
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某分部工程双代号网络图如下图所示，图中错误是（）。
A．存在循环回路
B．节点编号有误
C．存在多个起点节点
D．存在多个终点节点
参考答案：C
解析：
该双代号网络图中出现了①与⑥两个起点节点。
Please give kids a break. The request(要求) came after an online survey about 31 activities between classes. Some schools only 32 students to play in the corridors (走廊) during the ten-minute breaks, while 33 even make students do homework in the classroom. About this problem, different people have 34 ideas. 70% of parents in the survey said their children were not allowed to play 35 during breaks. Teachers should know children are 36 to be active, so education shouldn’t run 37 the laws(规律) of nature. “ It 38 that the playground is useless,” said one of the parents. Some parents agreed to 39 the school did. “ Games during breaks will make children too excited to listen to the teacher 40 in class.” Schools had their own reasons 41 this. Teachers were facing lots of responsibility(责任) over school 42 . Some schools stopped activities 43 children were injured （受伤）during breaks. 44 didn’t want to do so, but there was no better 45 to solve the problem.
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