【简答题】交际运用。根据对话内容,在空白处填写适当的话语(话语可能是一个句子,也可能是一个短 语或一个词),使对话完整。 A: It's spring now. The wind is blowing strongly. We can see plastic bags everywhere. 1 bad the environment is! B: Yes, as a citizen, it's imp...
【单选题】A basic characteristic for an ideal independent voltage source is:
A.
the voltage across it has no relationship with the current flowing through it, the current can be any value and is decided by the source and the external circuit.
B.
the voltage across it has relationship with the current flowing through it, the current can ‘t be any value and is decided by the voltage source.
C.
the voltage across it has no relationship with the current flowing through it, the current can be any value and flows out from the positive terminal of the voltage source.
D.
the voltage across it has relationship with the current flowing through it, the current can be any value and may flow out of any terminal of the voltage source.