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【单选题】
下列选项中,使用了缓冲区技术的流是( )A.
DataInputStream
B.
FileOutputStream
C.
BufferedInputStream
D.
FileReader
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反馈参考答案：
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】下列化学反应中,属于氧化还原反应的是
A.
Na 2 CO 3 ＋ CaCl 2 ==CaCO 3 ↓ ＋ 2NaCl
B.
Fe ＋ CuSO 4 ==Cu ＋ FeSO 4
C.
2NaHCO 3 Na 2 CO 3 ＋ CO 2 ↑ ＋ H 2 O
D.
＋ H 2 O==Ca （ OH ） 2
【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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