单项选择题

从传质的角度考虑，气速增高，气液间形成喘动的泡沫层是传质效率()

A、降低
B、提高
C、不变
D、不确定
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在预期收益一定的情况下,选定的折现率越大资产的评估价值越低。( ) A、正确 B、错误
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Complete the following sentences with appropriate words in the box. Change their forms if necessary. retain biodiverse sustainable renewable affordable calamity ubiquitous insulation In the past few years, however, researchers have turned their attention to the role that green roofs can play in the conservation of ____________ in towns and cities, where natural habitats are few and far between.
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