问题
填空题
实验室用酸碱指示剂来试验溶液的______，常用pH来表示溶液的______；当pH小于7时，溶液呈______性；当pH大于7时，溶液呈______性．
答案
酸碱指示剂常用来测定溶液的酸碱性，溶液酸碱性强弱即酸碱度则需要使用pH试纸进行测量，当pH＜7时，溶液呈酸性，当pH大于7时，溶液呈碱性．
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实验室用酸碱指示剂来试验溶液的______，常用pH来表示溶液的______；当pH小于7时，溶液呈______性；当pH大于7时，溶液呈______性．
酸碱指示剂常用来测定溶液的酸碱性，溶液酸碱性强弱即酸碱度则需要使用pH试纸进行测量，当pH＜7时，溶液呈酸性，当pH大于7时，溶液呈碱性．
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in all shapes. For example, puppy (a young dog) robots 1 like real ones. They jump and bark (吠). Robots can do many 2 people can't do. Robots can go where people can't go and bring back important information. In 1997, scientists sent a robot to Mars. It 3 pictures of rocks and soil, which helped scientists understand 4 our own planet works. Scientists even used a robot to make a 5 of a volcano. So robots are very 6 machines. They play a very important 7 in our life. They help people understand the world we live in. |