集成运放CF741内部结构采用晶体管的作用就是为了放大。
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集成电路工艺还不能制作大电容和电感。因此，集成电路中各级间的耦合只能选择直接耦合方式。
A. 对
B. 错
在单缝夫琅禾费衍射实验中,已知光波长为0.63mm,缝宽为0.1mm,缝后透镜焦距为0.55m,求透镜焦平面上中央亮纹的宽度。
It is our general/usual practice that business is subject to shipped quality.正确的翻译是()
A. It is our general/usual practice to pay by L/C.
B. It is our general/usual practice that not paying any commission.
C. It is our general/usual practice to sale by samples.
We will fax you our final settlement in three days.正确的指代是()
A. We will fax you the shipping date as soon as possible.
B. Please fax the shipping advice to us within 24 hours after shipment.
C. The sample could be faxed to the American importer tomorrow morning.
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