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【单选题】
当含盐30%的60千克盐水蒸发为含盐40%的盐水时，盐水重量为多少千克?（ ）
A.
45
B.
50
C.
55
D.
60
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【单选题】Obtaining Drinking Water from Air Humidity Not a plant to be seen，the desert ground is too dry．But the air contains water，and research scientists have found a (51) of obtaining drinking water from a...
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who
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【单选题】How the Body Keeps the Same Temperature The temperature of your body should be always just the same, no matter whether the weather is hot or cold. That is why the doctor uses his thermometer when you ...
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circumstance
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