【判断题】普通晶闸管外部有三个电极,分别是阳极、阴极和门极(控制极)。
【单选题】A great number of people have stopped buying the product ________ the fact that it is safe.
【单选题】What's experts' opinion about taking vitamin pills?
A.
It is safe for our health.
B.
It does more good than harm.
C.
It may bring us some side effects.
D.
It will reduce the length of colds.
【单选题】It is safe to infer from the passage that ______.
A.
lateral thinking is useful for creative problem-solving
B.
a lateral thinker is free from the restraint of assumptions
C.
lateral thinking can produce better and more effective solutions to problem than vertical thinking
【简答题】直流电动机根据励磁方式分类 [Blank 1] [Blank 2] [Blank 3] [Blank 4]