【多选题】一个NPN三极管发射结和集电结都处于正偏,则此三极管处于 状态;其发射结和集电结都处于反偏时,此三极管处于 状态;当发射结正偏、集电结反偏时,三极管为 放大 状态 [填空(1)] [填空(2)] [填空(3)]
【单选题】What happens to food when it is processed?
A.
The ultimate content remains the same.
B.
Vitamin information is not available after processing.
C.
Vitamins are added to the food.
D.
The vitamin content is reduced.
【单选题】切断传播途径是控制传染病流行的主要方法,以下做法中不属于切断传播途径的是( )
【单选题】导致保证人还款能力下降的主要原因是( )。
【判断题】保证人经济实力下降或信用状况恶化是导致保证人担保能力下降的主要原因,这种风险会使保证担保对银行债权的保障能力降低,第二还款来源不足。 ( ) 正确 错误
【单选题】What Can be inferred from the passage about the route to long life?
A.
It remains to be studied.
B.
It has already been discovered.
C.
Eating more leads to long life.
D.
Eating less leads to long life.
【单选题】关于传染病的预防,下列概念哪项是正确的()
A.
乙型肝炎疫苗是目前预防乙肝最有效的被动免疫方法
C.
肾综合征出血热不会由病人传给人,对病人血液及尿液无需隔离与消毒
【单选题】What is the question that remains to be studied?
A.
How to explain the long-term effects of the training.
B.
How to better improve older people's mental skills.
C.
How to attract more older people to take part in the training.
D.
How to increase older people's awareness of mental health.