A．To check the accuracy of scales.B．To calculate the de-找考题网

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A．To check the accuracy of scales.
B．To calculate the density of other metals.
C．To observe changes in the atmosphere.
D．To measure amounts of rainfall.

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A．There are no rapids or waterfalls.B．There is a constant, strong wind.C．Navigation is rather difficult.D．Frequent storms cause problems for riverboats.

A．There are no rapids or waterfalls.
B．There is a constant, strong wind.
C．Navigation is rather difficult.
D．Frequent storms cause problems for riverboats.

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