钠石灰在吸收二氧化碳时会发生下列哪些现象
A.产生碳酸钙
B.与氧化亚氮接触会产生有毒物质
C.生水
D.生热
E.产生酸性物质
参考答案:A,C,D,E
治疗产后缺乳的经验穴是()
A.小海
B.腕骨
C.后溪
D.前谷
E.少泽
We should consider the students' request_____the school library provide morebooks on popular science. [ ]
A. that
B.when
C.which
D.where