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【多选题】
如下关于电路变量方向的描述中，正确的是（ ）。A.
参考方向也称正方向，由于可任意设定，所以参考方向可以根据计算结果随意改变
B.
元件中的电流及其两端电压的实际方向是唯一的
C.
在参考方向下所讨论电路变量的计算值大于 0 ，说明参考方向与实际方向一致
D.
交变量的实际方向是不能确定的
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【单选题】听力原文： In the early 180Os, the paper industry was still using rags as its basic source of fiber as it had for many centuries. However, the rag supply couldn't keep up with the growing demand for paper....
A.
wood pulp was of good quality
B.
wood pulp was very cheap
C.
rags were not enough
D.
rags could not be obtained in the U. S.
【简答题】35 六级精度以上的孔加工应用 方法加工,七级精度的轴加工可用 方法加工。
【简答题】35 六级精度以上的孔加工应用 方法加工,七级精度的轴加工可用 方法加工。
【单选题】听力原文： In the early 180Os, the paper industry was still using rags as its basic source of fiber just as it had for many centuries. However, the rag supply couldn't keep up with the growing demand for p...
A.
Publishers wanted higher quality paper.
B.
Paper made from rags deteriorated too quickly.
C.
Wood pulp had become too expensive.
D.
The supply of rags was insufficient.
【单选题】Using source transformation, the current in the circuit is:
A.
4.5∠
B.
9∠
C.
4.5∠
D.
9∠
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