单项选择题

A. To check the accuracy of scales. B. To calculate the density of other metal.
C. To observe changes in the atmosphere. D. To measure amounts of rainfall.
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单项选择题
A. He was fired from his job. B. He was warned about being more punctual from now on. C. The management cut his working hours. D. He was promoted.
A. He was fired from his job.
B. He was warned about being more punctual from now on.
C. The management cut his working hours.
D. He was promoted.
单项选择题
A. How to care for precious metal. B. A standard unit for measuring weight. C. The value of precious metal. D. Using the metric system.
A. How to care for precious metal. B. A standard unit for measuring weight.
C. The value of precious metal. D. Using the metric system.
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