问题
选择题
正确量取8mL液体，应选用的最合适仪器有（ ）
①5mL量筒 ②10mL量筒 ③50mL量筒 ④胶头滴管．
A．①④
B．②
C．③④
D．②④
答案
选取量筒时要选取比所量液体体积大，且最接近的，误差小，当加液体时，快到刻度时要改用胶头滴管，减小误差．
故选D．
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正确量取8mL液体，应选用的最合适仪器有（ ）
①5mL量筒 ②10mL量筒 ③50mL量筒 ④胶头滴管．
A．①④
B．②
C．③④
D．②④
选取量筒时要选取比所量液体体积大，且最接近的，误差小，当加液体时，快到刻度时要改用胶头滴管，减小误差．
故选D．
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| 1. Who is from the USA? A. Masha. B. Marie. C. Michiko. D. Andrew. 2. What is Miehiko's dream? A. Visiting Egypt. B. Going from one place to another in a minute. C. Going to a top university. D. Inventing a language machine. 3. How old will Joma be when the 2008 Olympic Games are held? A. Fourteen. B. Fifteen. C. Sixteen. D. Eighteen. 4. Which sentence is RIGHT according to the passage? A. People in Tibet will be able to get to Beijing by train in about two days. B. Marie is now studying English in the USA. C. The Qinghai Tibet Railway hasn't been built yet. D. Masha wants to be a reporter when she grows up. 5. The best title(题目)for this passage would  be "______".A. I have a dream! B. Different students from different countries C. Five middle school students D. Our inventions |
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