标准雷电冲击电压波形参数是()
A: ±1.2/60us
B: ±1.2/50us
C: ±2.6/50us
D: ±2.2/50us
A: ±1.2/60us
B: ±1.2/50us
C: ±2.6/50us
D: ±2.2/50us
B
举一反三
- 标准的雷电冲击击穿电压波形为1.2／50（ ） A: m B: km C: μs
- 国际电工委员会（IEC）和我国国家标准规定的标准雷电冲击电压的波形为（） A: 2.6/40 B: 2.6/50 C: 1.2/40 D: 1
- 标准雷电冲击电压波的波形是（ ）。 A: 1/10µs B: 1.2/50µs C: 10/100µs D: 250/2500µs
- Could you please ________ 50 metric tons of peanuts A: quote us your best price for B: quote for us your best price for C: quote us for your best price for D: quote us at your best price
- Enclosed please find a check for US $50 to cover the application fee.
内容
- 0
Please let us have your offer ________ 50 metric tons ________ groundnuts．
- 1
To f_______ the transaction, we counter-offer as follows, US$ 50 per dozen CIF New
- 2
The flood caused an economic damage of US$（）million. A: 50 B: 90 C: 100 D: 500
- 3
标准操作冲击电压波的波形是( ) A: 1/10μS B: 1.2/50μS C: 100/1000μS D: 250/2500μS
- 4
Are there enough books for ____? A: three us B: us three C: all us D: the three us