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Every student has tests when they are at school. But have you ever been so worried about the tests that you can’t fall asleep at night? Have you ever felt sick or had a headache during a test? 小题1: This worry in your mind can make your body feel bad. You may feel angry, frustrated, scared, or afraid, which can give you a stomachache or a headache. 小题2: Good or normal stress might happen when you are called to answer a question in class or when you have to give a speech. This kind of stress can help you to get things better done.   小题3: But bad stress can happen if the stressful feelings keep going over a long time. You may not feel well if your parents are fighting, if a family member is ill, if you are having problems at school, or if you are going through anything else that makes you upset every day. 小题4: 小题5: That means making good decision about how to spend your time. If you are only dealing with school stuff and have no time to play, you can get stressed. Make sure you keep your SELF in mind: Sleep, Exercise, Leisure and Food. If you take care of yourself and get enough sleep and food, and if you exercise and leave time for fun stuff, you will probably be less stressed out! A.However, there are two different kinds of stress. B.Can you tell a kind of stress from another one? C.The best way to keep stress away is to have a balanced life. D.That kind of stress isn’t going to help you, and it can actually make you sick. E. Since bad stress is harmful to us, you’d better try to change it into good stress. F. If so, then you know what stress is. Stress is what you feel when you are worried or uncomfortable about something. G. For example, you may do a better job on your test if the stress pushes you to prepare well before the test.
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举一反三
【单选题】The librarian told me that I could _____ these magazines for three days.
A.
borrow
B.
keep
C.
return
【简答题】设某企业的利润函数为 ,求使利润最大的产量q.
【简答题】进程的基本特征有 、 、独立性、异步性及结构特征。
【单选题】Jack told the librarian that he ______ the book as soon as he finished reading it.
A.
returned
B.
would return
C.
has returned
D.
will return
【简答题】进程的基本特征有 () 、() 、独立、异步及结构特征
【判断题】电动机铭牌上标注的额定电压为380/220V,接法为Y/△,表明定子每相绕组的额定电压是220V。
A.
正确
B.
错误
【单选题】阅读下面的问题,如果假设生产甲型、乙型微波炉的台数分别为x,y,那么此题的目标函数为( ): 某微波炉生产企业计划在下季度生产甲、乙两种型号的微波炉.已知每台甲型、乙型微波炉的销售利润分别为3和2个单位.而生产一台甲型、乙型微波炉所耗原料分别为2和3个单位,所需工时分别为4和2个单位.若允许使用原料为100个单位,工时为120个单位,且甲型、乙型微波炉产量分别不低于6台和12台.试建立一个数学...
A.
3x+2y
B.
2x+3y
C.
4x+2y
D.
100x+120y
【单选题】The librarian ________ told Mary where to find the books she wanted.
A.
hopelessly
B.
helpfully
C.
helpful
【单选题】The librarian told me that I could ______ these magazines for three days.
A.
borrow
B.
buy
C.
keep
D.
return
【简答题】某企业使用同样的变动投入要素和固定设备生产变动比例的联产品:优品和极品。它们的生产函数分别为 Q优=4.0H优 和Q极=2H极 H优和H极分别是生产优品和极品的变动要素投入的小时数,投入要素的总小时数为 H=H优+H极 变动投入要素的供给函数为 P=5.0+0.25H 另还有20000的固定投入。 这两种产品面对的需求函数分别为 Q优=1500-25P优 Q极=600-4P极 试求利润最大化时用了...
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