This procedure is of high yield and simple operation and benefit to enhance teaching effect.
改进的方法制备收率高，反应操作简单，更有利于实验教学。
Teaching effect should lie in the high teaching efficiency.
在教学效果上要注意追求高效性。
The electric bridge has advantages of simple circuit, good teaching effect and high practical value.
电路简洁，教学效果好，实用性强。
The electric bridge has advantages of simple circuit, good teaching effect and high practical value.
电路简洁，教学效果好，实用性强。
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