差分放大电路产生零点漂移的主要原因是:_________。
A. 电压增益太大
B. 环境温度变化
C. 采用直接耦合方式
D. 采用阻容耦合方式
查看答案
电流源电路的特点是: ______。
A. 一个双口网络
B. 端口电流恒定,交流等效电阻小
C. 端口电压恒定,交流等效电阻大
D. 端口电流恒定,交流等效电阻大
根据包含原则，哪一项最有可能是正确答案？
A. It made news all over the world.
B. It was built for the royal family.
C. It marked a new era in motor travel.
D. It attracted large numbers of motorists.
根据常识原则，哪一项可以最先排除？
A. He had only a third-grade education.
B. He once threated to kill his teacher.
C. He often helped his mother do housework.
D. He grew up in a poor single-parent family.
根据求同原则，以下哪些选项从涉及的方面来看是一致的？
A. Watch educational TV programs only.
B. Write two book reports a week.
C. Help with housework.（家务）
D. Keep a diary. （教育）
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