When two two-terminal networks are equivalent, they are equivalent to ( ). A: external circuit B: internal circuit C: external circuit and internal circuit D: neither external circuit nor internal circuit

PCB的英文全称是 A: Printed Circuit Board B: Play Circuit Board C: Printed Circuit Box D: Play Circuit Box

Microcontroller minimum system circuit is the microcontroller can work the smallest circuit, generally including the clock circuit and reset circuit.

A closed path followed by main magnetic flux is known as a ( ). A: Magnetic circuit B: Electric circuit C: Magnetic saturation circuit D: None of the above

An open circuit pn junction under illumination generates an open circuit voltage Voc.

short circuit

A ______ circuit is one in which the current flows in a single continous path and is of the same value at every point in circuit

【单选题】The types of short-circuit in three-phase system are three-phase short-circuit, two-phase short-circuit, two-phase short-circuit grounding and single-phase short-circuit grounding. When the three phases of the system are short-circuited, they are still in the symmetrical stated. Other types of shorted circuit are asymmetric short circuit. Which of the following types is a symmetrical short circuit? A. Single phsae ground short circuit B. Three phase short circuit C. Two phase short circuit D. Two phase ground short circuit

In the circuit , then i=( ).f35803b1d9499749a47a43a19961bad4.png07cfeec3e482bc6316c1ccb7a5c09cff.png

“circuit diagram”的意思（）