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Science
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Which of the following is the chief constituent of...
Single Choice
Which of the following is the chief constituent of limestone:
A.
quartz
B.
clay
C.
sand
D.
calcite
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[问答题] If a line has a slope of 10, what is the slope of every line that is perpendicular to it?
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[单选题] Which of the following best describes how stalagmites in caves are formed:
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