【判断题】
在匀强磁场中,通过与磁感线方向垂直的某一截面的磁感线的总数,叫做穿过这个面的磁通。
【判断题】
直流电路中,没有电压之处就一定没有电流。
【判断题】
戴维宁定理适用于线性的有源二端网络。如果有源二端网络中含有非线性元件时,也可以应用戴维宁定理求解。
【判断题】
直流电路中,有电流通过之处就一定有电压。
【判断题】
导线运动方向与导线本身垂直,而与磁感线方向成 角时,导线切割磁感线产生的感应电动势的大小为E=Blvsinθ。
【单选题】
______ for over 30years, we have great confidence in offering customers with premium products and services.
④
Having been in the line
【单选题】
What are we going to do? I am ________ your suggestion.
【单选题】
As these machines are precision instruments which cannot stand rough handling, the wording” Handle with Care” should be also marked ____ each case.
【单选题】
Should your products prove _________ in quality and reasonable in price, I trust substantial order will follow .
【单选题】
Considering your first transaction with us, we would like to ask you to offer name and address of your bank so as to enable us to ______ references.