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hoi Yin

2006-10-27 3:54 am

1.what is used to clean test-tube after an experiment?
a.tooth brush
b.cleaning cloth
c.test-tube rack
d.test-tube brush

2.which of the following steps of using a measuring cylinder is WRONG?
a.the eye should be at the same level of the liquid surface.
b.we must hold the measuring cylinder with our right hand for taking the reading.
c.the measuring cylinder should be upright.
d.we must take the reading corresponding to the bottom of the meniscus.

回答 (2)

2006-10-27 3:59 am

✔ 最佳答案

1.what is used to clean test-tube after an experiment?
a.tooth brush(wrong use)
b.cleaning cloth(wrong use)
c.test-tube rack wrong use)
d.test-tube brush

2.which of the following steps of using a measuring cylinder is WRONG?

a.the eye should be at the same level of the liquid surface. correct
b.we must hold the measuring cylinder with our right hand for taking the reading.
Wrong! We shouldstand it on the table
c.the measuring cylinder should be upright. correct

d.
we must take the reading corresponding to the bottom of the meniscus. correct

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用戶169251

2006-10-27 3:59 am

1.d
2.d

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