单项选择题

混凝土配合比的三要素不包括。

A、单位用水量
B、砂率
C、最大粒径
D、水胶比

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根据《上海海上搜救应急预案》，蓝色预警是指雾、雪、暴风雨等造成能见度不足（）米

A.1500
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Assets are often listed in the order of their ________ — which means how easy it would be to convert each asset into cash.

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