题目内容

Staircases incorporated behind the kitchen's storage units _________ the bedrooms, and down to a basement containing additional lounge areas, a gym and additional guest bedrooms.

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He acted quickly because the man's life was ________.

Put dirty disher in the dishwasher, or _________, the sink.

Increased production will, __________, lead to increased profits.

采用乙醇沉淀法除去水提取液中多糖蛋白质等杂质时,应使乙醇浓度达到

A. 50%以上
B. 60%以上
C. 70%以上
D. 80%以上

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