The saw-tooth carrier waves with positive or negative slope alternately are studied and applied into the three-phase PWM inverter soft-switching operation.
研究采用正负斜率交替的锯齿载波，成功地解决了主电路在任何电压矢量下都能实现零电压开关动作；
Which usually has a negative slope, except for the two most important substances on Earth, which are water and silicon. So for water and silicon, we have positive slope.
它的斜率一般负的，除了水和水和硅以外，对于水和硅，斜率是正的。
Finally, several special voltage control circuits are described, which could realize negative slope voltage control characteristic and improve the voltage control symmetry performance.
介绍了几种可以实现负斜率压控特性和改善压控对称性的压控电路。
Slope bioengineering has significant protective effect on ecology environment, yet vegetation has complex effect on the stability of slope, it plays both positive and negative roles.
植被护坡在改善生态环境方面的作用是显著的，但植被对坡体稳定性的影响却很复杂，积极与消极的作用共存。
Slope bioengineering has significant protective effect on ecology environment, yet vegetation has complex effect on the stability of slope, it plays both positive and negative roles.
植被护坡在改善生态环境方面的作用是显著的，但植被对坡体稳定性的影响却很复杂，积极与消极的作用共存。
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