电压型变频器直流环节并入电容对整流电路的输出进行滤波,理论上电容值越大,电压纹波越小,但是从空间和成本上考虑并不能如此。
The three phase half-wave controlled rectifying circuit is taken as the example in this paper to inllustrate the commutation overlap probelm.
系统在复杂性和成本上取得了优势,可以不考虑舰艇的类型,其类型范围从非常小的、单个操作员控制的系统到由35名以上操作员控制的大型系统。
The systems are balanced in complexity and cost, pending the type of ships, and range from very small, single operator systems to large systems of 35 + operators.
除了那些能看得见的成本外,花在筛选简历上的时间等无形成本也需要考虑在内。
Intangible costs such as time spent sifting through CVs need to be taken into account on top of the more obvious expenses.
In addition, this is just the cost of the vaccine, not the cost of the doctor or nurse who injects it into, you so you have to figure that cost in as well.
另外,这个仅是疫苗本身的成本,还没算上医生或者护士的成本,所以你还得同时考虑这些成本
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