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【判断题】
放大器的输出电阻是从放大器输出端看进去的交流等效电阻,其中包括外接负载电阻。A.
正确
B.
错误
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Many English houses are known only by a name. If you have difficulty in finding such a house, you may try asking the local shopkeepers.
A.
Appropriate.
B.
Inappropriate.
【单选题】下列化学反应中,属于氧化还原反应的是
A.
Na 2 CO 3 ＋2HCl==2NaCl＋H 2 O+CO 2 ↑
B.
AgNO 3 +NaCl=AgCl+NaNO 3
C.
Fe+CuSO 4 ===Cu+FeSO 4
D.
2NaOH+H 2 SO 4 =Na 2 SO 4 +2H 2 O
【简答题】下列化学反应中，属于氧化还原反应的是( )。
【单选题】对于含 n 个原子的非线性分子,其红外光谱
A.
有3n-6个基频峰
B.
有3n-6个吸收峰
C.
有少于或等于 3n-6个基频峰
D.
有少于或等于 3n-6个吸收峰
【判断题】Many English houses are known only by a name. If you have difficulty in finding such a house, you may try asking the local shopkeepers.
A.
正确
B.
错误
【判断题】Many English houses are known only by a name. If you have difficulty in finding such a house, you may try asking the local shopkeepers
A.
正确
B.
错误
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