三个正方体棱长的比为1:2:3,则体积之比为1:4:9.______.

题型:解答题

问题:

三个正方体棱长的比为1:2:3,则体积之比为1:4:9.______.

考点:长方体的体积正方体的体积
题型:解答题

有两只电阻器,已知R1=3Ω,R2=5Ω.若串联在电路中,则电压之比U1:U2=______;若并联在电路中,则电功率之比P1:P2=______.

题型:解答题

[1] Mental and health experts believe personality plays an important part in how we experience stress. Personality is the way a person acts, feels and thinks.

[2] Some people are aggressive and always in a hurry. They often become angry when things do not happen the way they planned. They are called “Type A” personalities. Studies suggest that these people often get stress-related disorders. The “Type B” personality is calmer. These people are able to deal with all kinds of situations more easily. As a result, they are less affected by stress.

[3] Studies have also shown that men and women deal with stress differently. Women seem to be better able to deal with stress than men are. However, experts say women are three times more likely to develop depression(抑郁) in reaction to the stress in their lives. American writer John Gray became famous for his book Men are from Mars, Women are from Venus(金星). He notes that men and women have opposite ways of dealing with stress. For a man, the best way is to rest and forget about daily problems. But a woman suffering from stress needs to talk about her problems.

[4] Experts say there are several ways to deal with stress, including deep breathing, exercise, eating healthy foods, getting enough rest and balancing the time spent working and playing. Exercise is one of the most effective stress- reduction measures, as physical changes from exercise make you feel better. In addition, exercise can also improve the body’s defense system against disease.

[5] Keeping stress to yourself can make problems worse. Experts say that expressing emotions to friends or family members or writing down your feeling can help reduce stress. And they also suggest that people should attempt to accept or change stressful situations whenever possible.

小题1: What does Paragragh 2 mainly talk about? ( No more than 15 words)

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小题2:Please explain the underlined word “ aggressive” in paragraph 2. ( No more than 5 words)

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小题3:According to this passage, why does physical exercise help reduce stress?( No more than 20 words)

_________________________________________________________________________

小题4:What shouldn’t you do when you have stress problems and why?( No more than 15 words)

_________________________________________________________________________

小题5:Are you a “Type A” personality or a “Type B” personality? How should you deal with stress in your daily life? ( No more than 25 words)

题型:解答题

直接影响 * * 上皮细胞自净作用的激素是()

A.雄激素

B.孕激素

C.FSH

D.LH

E.雌激素

题型:解答题

用手触摸检查电动机轴承温度,当温度超过()时应及时汇报检修单位。

A、50摄氏度

B、65摄氏度

C、75摄氏度

题型:解答题

一般将防腐剂分为______、______和______3种。

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