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【多选题】
预防流感的有效方法有( )。A.
接种疫苗
B.
保持个人卫生，勤洗手
C.
经常通风，保持室内空气清新
D.
外出时佩戴口罩
E.
均衡饮食，及时增减衣物
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】可燃气体泄漏报警和控制电路如下图所示,下列有关电路元器件选择和作用说明不正确的是:
A.
RP1用于调节传感器的灵敏度。
B.
RP2用于调节报警电路的起控浓度,调节RP2可以使U2B反相端电位在2.25V到5V之间变化。
C.
电路中7805器件的作用是限流。
D.
该报警器主要由传感器检测电路、传感器预热电路、报警与控制电路和电源电路等四部分组成。
【简答题】(1) What is it? (2) What is it made of? (3) What did the early people use them for? (4) What can you learn about the life of early people from it?
【简答题】现代主义的产生带有明确的
【单选题】What can people do as an effective measure to combat cyber bullying?
A.
To use the internet as less as possible.
B.
To selectively ignore those offensive and humiliating comments, e-mails and photos, etc.
C.
To call on the government to take measures to normalize people’s network behaviors.
D.
To change their beliefs and show more compassion and empathy.
【简答题】Besides the functions as a vital entertainment medium, what else can people use a TV as?
【单选题】What can people do if they want to use the air conditioner less?
A.
Open the windows
B.
Go outside
C.
Stay indoors
D.
Wear fewer clothes
【简答题】调查某地 120名健康女性血红蛋白,直方图显示,其分布近似于正态分布,其血红蛋白平均值为117.4(g/L),标准差为10.2 (g/L),试估计该地健康女性血红蛋白的95%医学参考值范围。
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