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刷刷题刷刷变学霸
举一反三
【单选题】Entertainment in LondonBuying Books Londoners are great readers. They buy vast numbers of newspapers and magazines and even of books especially paperbacks, which are still comparatively cheap in spite...
A.
It’s to the cast of London.
B.
It’s street of bookstores.
C.
It’s a center for second-hand books.
D.
It’s where worthless books are sold.
【单选题】下列各组离子在pH=10的溶液中一定能大量共存的是（ ）
A.
H+、Cl-、NO3-
B.
Na+、NH4+、CO32-；
C.
Ba2+、Na+、Cl-
D.
Mg2+、SO42-、NO3-