水泥混凝土中砂子体积与砂石总体积之比的百分率称为砂率。
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Theplantsneedsandwitha___(deep)ofatleast10to15cmtogrow.
Notuntilrecently_____thatThompsonhadbentellingthetruthallalong
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Onehundredmiles____(be)toofartotravelonfoot.
国家之间发生经济联系的必然性取决于()
