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【简答题】
学习了酸和碱的性质之后，在实验室进行了下列实验： （1）取少量稀盐酸与一定质量的氢氧化钠溶液充分混合后得到混合溶液A 1 ，向A 1 中加入碳酸钠溶液，有气泡产生．说明A 1 显 ______性； （2）另取少量稀盐酸与一定质量的氢氧化钠溶液充分混合后得到混合溶液A 2 ，向A 2 中滴加无色酚酞试液，溶液变红．说明A 2 显 ______性； （3）酸碱指示剂可以指示溶液的酸碱性，pH可以表示溶液的 ______．综合（1）和（2）可知，A 1 的pH ______A 2 的pH（选填“＞”、“＜”或“=”）．
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C.
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【多选题】工程量清单是市场经济的产物,并随着市场经济的发展而发展,他必须遵循市场经济活动的基本原则,即( )的原则
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【单选题】The girl with her grandparents for the moment because her parents are both very busy this month.
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