下载APP
举一反三
【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-
【单选题】The Scottish countryside will soon be home to creatures which is strange to Britain. This spring, 17 beavers (海狸) will be released into a remote area of rivers and forests. Hunted to extinction throug...
A.
Not all the people support setting loose wild animals in Britain
B.
Some small mammals will be out of control in Britain
C.
The landowners don"t like beavers because of the possible disasters
D.
British Parliament has proposed several times to bring beavers back