A statewide crackdown on dirty diesel lorries and a push to expand use of zero-emission vehicles are also a big part of the story.
另外一个重要原因是在全国范围内强制取缔不清洁的柴油卡车以及扩大零排放车辆的使用。
This paper presents a novel zero voltage and zero current switching (ZCS) PWM push pull three level converter in which the voltage stress of switches is input voltage.
本文提出了一种新型的零电压零电流开关pwm推挽三电平直流变换器，其中开关管的电压应力为输入电压。
Several zero voltage and zero current switching PWM push pull three level converters are proposed.
最后，本文还提出了另外几种零电压零电流开关PWM推挽三电平直流变换器。
But when the goal is to push risk as close to zero as possible, spending can asymptotically stretch into infinity.
但是，一旦防范目标变成尽可能地把风险降低到趋于零时，相关开支就有可能渐渐扩大到无穷大。
Pressure Angle is never zero, the transmitted force always tends to push centers of the gear apart.
压力角不会是零，传动力总是倾向于把齿轮的中心分开。
Extend the platform to allow businesses to push content and messages to customers (even if their prepaid balance is zero) and open call control capabilities focused upon business applications.
扩展该平台，使企业能够将内容和信息发给客户(即使客户的预付费账户余额为零)并打开针对业务应用的呼叫控制功能。
Extend the platform to allow businesses to push content and messages to customers (even if their prepaid balance is zero) and open call control capabilities focused upon business applications.
扩展该平台，使企业能够将内容和信息发给客户(即使客户的预付费账户余额为零)并打开针对业务应用的呼叫控制功能。
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