【判断题】由分立元件组成的三极管“非”门电路,实际上是一个三极管反相器:
【判断题】三相PFC电路从其功能和本质看,实际上是一种有源电力滤波器。
【单选题】Dia.5 Listen to the dialogue once and answer the questions.
【多选题】影响大空间沸腾传热的主要因素有
B.
流体的物性,如气化热、导热系数、密度、黏度等
【单选题】Dia.4 Listen to the dialogue once and answer the questions.
【多选题】影响对流传热系数的因素有哪些
A.
流体的相态变化和引起流动的原因(强制对流传热和自然对流传热)
D.
流体的物理性质(包括流体的比热容、导热系数、密度和黏度等)
【单选题】Dia.3 Listen to the dialogue once and answer the questions.
【单选题】Dia.2 Listen to the dialogue once and answer the questions.
【单选题】How is Dia de los Meurtos different from Halloween?
A.
On Dia de los Meurtos, people do not honor the dead.
B.
On Dia de los Meurtos, people do not wear costumes.
C.
On Dia de los Meurtos, people are more light-hearted.