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【单选题】
所谓汽化是指物质由液态转变为气态的过程。汽化有两种形式:一种叫 ,另一种叫 。在制冷工程技术中,制冷剂在管道中的汽化称为“ ”。液化是汽化的反过程,在制冷技术中通常称制冷剂的液化为“ ”。A.
蒸发，沸腾，沸腾，冷凝
B.
蒸发，升华，蒸发，凝华
C.
蒸发，沸腾，蒸发，冷凝
D.
蒸发，升华，沸腾，凝华
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【简答题】油漆桶工具的快捷键是?
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【单选题】At each step along the way, economic pessimists warned that the economy was about ____ tumble into a yawning chasm.
A.
into
B.
to
C.
on
D.
for
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