Speed reading eraining was less effective for articles with high levels of difficulty.
难度较大的文章，不适于采用快速阅读；
From the point of energy saving, change the rotor speed control is the most effective.
从节能角度讲，改变转子转速调节是最有效的。
It has provided an effective method to avoid the crack of high-speed steel forgings.
此方法已经有效地防止了锻件中心开裂。
It has provided an effective method to avoid the crack of high-speed steel forgings.
此方法已经有效地防止了锻件中心开裂。
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