第21题: [单项选择]Questions 23 to 28 are based on the conversation you have just heard. A. They can not accomplish their daily tasks. B. They suffer injuries from less amount of sleep. C. They get no damage in their performance. D. They operate worse than normal. 参考答案:C 答案解析:[听力原文] Q: How does less sleep impact on those flies [一点即通] 男士的回答don’t seem to suffer injurie
第33题: [单项选择]关于双代号网络图的绘制,下列说法不正确的是( ) A. 双代号网络图必须正确表达已定的逻辑关系 B. 网络图中严禁出现循环回路 C. 网络图中不许出现母线法 D. 只允许有一个起始和一个结束工作 参考答案:C 答案解析:[解析] 双代号网络图必须正确表达已定的逻辑关系;严禁出现循环回路;在节点之间严禁出现带双向箭头或无箭头的连线;严禁出现没有箭头节点或没有箭尾节点的箭线;某些节点有多条外向箭线或多条内向箭线时,可使用