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A. stress B. quantify C. streamlines D. occasionally E. disrupted F. communities G. frequently H. sphere I. immersed J. supervision K. administrate L. addiction M. social N. challenges O. financial In some urban centers, workaholism ( 工作狂 ) is so common that people do not consider it unusual: They accept the lifestyle as normal. Government workers in Washington D.C., for example, 1 work 60 to 70 hours a week. They don’t do this because they have do; they do it because they want to. Workaholism can be a serious problem. True workaholics, being deeply 2 in their work, allow themselves little or no time to take breaks. They like to work without being 3 , and they probably don’t know how to relax. But is Workaholism always bad? Perhaps not. There are people who work well under 4 . Besides, some studies show that many workaholics have great energy and interest in their own 5 . Their work is so pleasurable that they are actually very happy. For most workaholics, work and entertainment are the same thing. Their work 6 them, keeping them busy and genuinely engaged. Why do workaholics enjoy doing their jobs so much? Of course they get paychecks from it, but it is hard to 7 the pleasure with money. It offers more than 8 security. Psychologists claim that work gives people an identity and provides them with self-confidence. People have a feeling of satisfaction when they 9 a business well or complete a challenging piece of work. In addition, most jobs provide a socially acceptable way for people to meet others. So, thought some people are compulsive ( 强迫性的 ) about their work, their 10 seems to be a safe or even an advantageous one. They feel empty and incomplete when they are involved in activities not related to work.
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【简答题】燃料电池(Fuel Cell)是燃料电池电动汽车的 ,其主要构成有 电极 、 电解质、隔膜 与 集电器 等。燃料电池是利用 和 在催化剂的作用下经电化学反应直接产生 电能。
【简答题】微生物燃料电池(MFC)是燃料电池中特殊的一类,它利用微生物作为反应主体.将有机物的化学能转化为电能。以葡萄糖溶液作底物为例,其工作原理如图所示。 已知石墨电极上的反应为 C 6 H 12 O 6 + 6H 2 O - 24e - ='====' 6CO 2 + 24H + (1)电池中的质子交换膜只允许质子和水分子通过。电池工作时,质子移向电池的_ __极(填正或负),铂碳上所发生的电极反应式为...
【多选题】焊接对焊钳的要求是( )。
A.
必须有良好的绝缘性
B.
不易发热
C.
导电性能要好
D.
与焊接电缆连接应简便可靠,接触良好
E.
更换焊条方便
【判断题】在堆肥产品中,可以利用磁力分选将其中的铝、铁、铜、锌等金属分离回收。
A.
正确
B.
错误
【多选题】对焊接电缆的要求是:
A.
绝缘性良好
B.
柔软性好
C.
具有足够的导电截面积
D.
用多股紫铜软线制成
【判断题】影响燃料电池发动机性能的主要因素是燃料电池系统
A.
正确
B.
错误
【多选题】焊接电缆是从焊接电源向焊钳和焊件传递焊接电流的关键部件。对焊接电缆有( )要求?
A.
要有足够的导电截面
B.
外包橡胶套管绝缘外
C.
还应有较好的柔软性,易于弯曲
D.
便于焊接操作
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【多选题】对焊接电缆的要求是:()
A.
要有足够的导电截面积
B.
柔软性好
C.
导体电阻必须很小
D.
绝缘良好
【单选题】NaBH 4 /H 2 O 2 燃料电池(DBFC)的结构如下图,有关该电池的说法正确的是
A.
电极B是燃料电池的负极
B.
电池的电极A反应为:BH 4 - +8OH - -8e - ===BO 2 - +6H 2 O
C.
放电过程中,Na + 从正极区向负极区迁移
D.
在电池反应中每消耗1 L 6 mol/L H 2 O 2 溶液,理论上流过电路中的电子为6 N A 个
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