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【单选题】
25 °C 时,某水溶液中离子浓度 c (OH - )= 1 × 10 -9 mol/L ,则该溶液的 pH 是( )A.
1
B.
3
C.
5
D.
7
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皮皮学刷刷变学霸
举一反三
【单选题】Restore points are set automatically when you ____.
A.
turn your computer on
B.
open an e-mail attachment
C.
install new software
D.
download files
【单选题】Several trial efforts in the 1980s proved that it was financially ______ to restore old buildings.
A.
feasible
B.
probable
C.
beneficiary
D.
passable
【简答题】分析仪器一般较为复杂，但通常是由信号发生器、信号处理器、检测器、显示与处理等四个基本部件组成。 ( )
【简答题】Driving Offence Points System What is Driving Offence Points System? After the introduction of this system, certain traffic offences will earn the driver points besides other punishment. If a driver m...
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