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
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
Enclosed please find a check for US $50 to cover the application fee.
Enclosed please find a check for US $50 to cover the application fee.
Could you please ________ 50 metric tons of peanuts A: quote us your best price for B: quote for us your best price for C: quote us for your best price for D: quote us at your best price
Could you please ________ 50 metric tons of peanuts A: quote us your best price for B: quote for us your best price for C: quote us for your best price for D: quote us at your best price
Please let us have your offer ________ 50 metric tons ________ groundnuts．
Please let us have your offer ________ 50 metric tons ________ groundnuts．
To f_______ the transaction, we counter-offer as follows, US$ 50 per dozen CIF New
To f_______ the transaction, we counter-offer as follows, US$ 50 per dozen CIF New
The flood caused an economic damage of US$（）million. A: 50 B: 90 C: 100 D: 500
The flood caused an economic damage of US$（）million. A: 50 B: 90 C: 100 D: 500
Now it’s 4:50 already, and the rain (pour) down like this. They must be waiting for us impatiently.
Now it’s 4:50 already, and the rain (pour) down like this. They must be waiting for us impatiently.
中国大学MOOC: 50 million businesses don’t have a website, that’s (2)__ of all US businesses.
中国大学MOOC: 50 million businesses don’t have a website, that’s (2)__ of all US businesses.
在RC微分电路中，已知R=100Ω，C=0.5uF，电路的时间常数为（）。 A: 50uS B: 0.2ms C: 5uS
在RC微分电路中，已知R=100Ω，C=0.5uF，电路的时间常数为（）。 A: 50uS B: 0.2ms C: 5uS
Are there enough books for ____? A: three us B: us three C: all us D: the three us
Are there enough books for ____? A: three us B: us three C: all us D: the three us