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【简答题】
乘客可以在地铁上吃喝吗? 题目要求: Recently in many cities, such as Shanghai, Nanjing and Wuhan, passengers are not allowed to eat or drink on subways, and violators shall be fined. Should food and drinks be permitted on subways? The debate has been raging in China for a long time. Governments and passengers show different attitudes. Read carefully the opinions from both sides and write your response in about 200 words, in which you should first summarize briefly the opinions from both sides and give your views on the issue. Marks will be awarded for content relevance, content sufficiency, organization and language quality. Failure to follow the above instructions may result in a loss of marks. YES According to the laws and regulations, items that pose threats to the security of passengers cannot be taken to the subway. However, food and drinks will do no harm to the passengers’ safety, and therefore should not be forbidden. Besides, it is every citizen’s right to eat and drink during public transportation. This right should not be deprived of by the government. When passengers have to travel on subways for nearly one hour, it is necessary for them to eat some snacks or drink some water. If food and drinks are forbidden, it will cause inconvenience to some elderly passengers and children. In addition, many young people have to eat their breakfast on the subway when they go to work in the morning in order to save time. The new regulation will also affect their normal life and work. NO It is every citizen’s responsibility to build a clean and healthy public environment. Some passengers bring food and drinks to the subway, and leave litter everywhere. This inappropriate behavior. makes the subway look messy and untidy. For citizens and tourists who travel on the subway, they will inevitably have a terrible impression of this city. The subway is a relatively closed space, and therefore any unpleasant smell can easily spread inside the subway and cause uncomfortable feelings among passengers. Some food and drinks, such as the steamed buns or some other traditional Chinese breakfast, often carry strong smell. Although for people who are eating and drinking, it is of no harm, for others, the unpleasant smell may make them feel sick.
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【单选题】凡电路中的电流,电压的大小和方向随时间而()的称稳恒电流,简称直流。
A.
大小变,方向不变
B.
大小不变,方向变
C.
大小方向都不变
D.
大小方向都变
【单选题】电力线路的功率损耗是指()
A.
有功功率损耗;
B.
无功功率损耗;
C.
功率和无功功率损耗。
【单选题】电力线路的功率损耗是指()
A.
线路电压损耗
B.
线路电能损耗
C.
有功功率损耗
D.
无功功率损耗
E.
有功功率和无功功率损耗
【单选题】线损率是国家考核供电企业的重要()指标。
A.
经济
B.
技术
C.
技术经济
【简答题】线损率是指线损电量与()的百分比。
【单选题】以下哪一个不是弹性力学的基本假设。
A.
均匀性假设
B.
连续性假设
C.
等截面假设
D.
小变形假设
【单选题】根据《南方电网公司管理线损管理办法》,分线、分台区线损异常是指分线、分台区线损率同比同期值或计划值偏差过大,数值偏差超过正负()个百分点。
A.
2
B.
0.5
C.
1
D.
1.5
【判断题】输电线路的线损率是指输电线路的年电能损耗 W和线路末端输出的年电能 W2 的比值,常用百分值表示。( )
A.
正确
B.
错误
【判断题】电路中,电流的大小和方向都不随时间变化的电路,称为直流电路。()
A.
正确
B.
错误
【单选题】线损率是指( )。
A.
线路功率损耗与始端输入功率之比
B.
线路功率损耗与末端输入功率之比
C.
线路电能损耗与始端输入电能之比
D.
线路功率损耗与末端输入电能之比
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