引入电流串联负反馈后,放大器的输出阻抗增加,输入阻抗()。
A.增加
B.减小
C.不变
D.为零
参考答案:A
The mistakes made by Chinese students are quite different from ________made by the Japanese students in English study.
A.That
B.which
C.what
D.those
患者,男,27岁。干咳少痰,咳声短促,痰中带血,五心烦热,时有盗汗,形体消瘦,胸部闷痛隐隐,舌红少苔,脉细数。其诊断是()
A.咳嗽肺阴亏耗证
B.肺痨肺阴亏损证
C.哮证肺虚证
D.喘证肺虚证
E.虚劳肺阴虚证