— are you going to take?
—Books and clothes.[ ]
A. What
B. Why
C. Where
答案:A
t0C时硝酸钾的溶解度为a克,该温度下把b克硝酸钾投入c克水中充分溶解.
(1)当a100>bc时,溶液中溶质质量分数为______%.
(2)当a100≤bc时,溶液中溶质质量分数为______%.
在环境影响评价中做好()是生态影响评价的重要基础。
A.群落结构分析
B.物种评价
C.现状调查
D.水土流失预测