在初中化学里,常常会出现加号、减号、箭号等符号,它们同样是重要的化学用语.在教学中,加强对化学用语的教学是极为重要的.初中同学往往对这些符号分辨不清,使用不当经常出错.现将初中化学常出现的一些符号的意义说明如下.1.“△”表示加热,温度范围一般是酒精灯火焰的温度范围 In junior high school chemistry, symbols such as plus, minus, and arrow are often present. They are also important chemical terms. In teaching, it is extremely important to strengthen the teaching of chemical terms. Junior high school students often distinguish these symbols. Clear, improper use is often wrong. Now the meaning of some of the symbols often appear in junior high school chemistry are described below. 1. “△” indicates heating, the temperature range is generally the temperature range of the flame of the alcohol lamp