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【简答题】
酸碱反应与人们的日常生活和生产有密切的关系． （1）未成熟的水果大多具有涩味，这是因为水果里含有鞣酸．脱涩的方法之一是：先用少量的生石灰转化成石灰乳，该变化的化学方程式是______，然后把它用清水稀释，取上层清夜，浸泡水果5至6天即可除去涩味． （2）人被昆虫叮咬后皮肤红肿起泡，这是由于昆虫在皮肤内注入了少量甲酸所致．把少许右表所列的生活常用品______（填编号）被咬的皮肤上，痛痒便会消失． 物质 A B C 肥皂水 食醋 食盐水 pH 10 3 7
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皮皮学刷刷变学霸
举一反三
【单选题】与BCR共同组成BCR复合物的是
A.
CD19和CD21
B.
CD28和CD152
C.
CD79a和CD79b
D.
CD80和CD86
E.
CD40和CD40L
【简答题】选用空气压缩机是依据气动系统所需的[填空(1)]和流量和一些特殊的工作要求。
【简答题】Tom is the son of a farm owner. One New Year’s Day, when he was 15, his father asked him 36 on the farm for one year when he was free. Tom was 37 with his father’s idea.“That isn’t my job. I have 38 s...
【简答题】Tom is the son of a farm owner. One New Year’s Day, when he was 15 ,his father 16 him to work on the farm for one year when he was free. Tom was 17 with his father’s idea. “That isn't my job. I have 1...
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