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【单选题】
3-1、于60 mL 0.10mol/L N a 2 C O 3 溶液中加入40 mL 0.15mol/L HCl溶液,所得溶液的简化质子条件是 ( )A.
[H2CO3] = [HCO3-]
B.
[HCO3-] = [CO32-]
C.
H2CO3] = [CO32-]
D.
[H2CO3] = [H+]
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【单选题】----Are Mr. and Mrs. Wang living alone in the house? ----Yes, altough they have three sons, of them live with their parents.
A.
neihter
B.
both
C.
all
D.
none
【单选题】-Are Mr. and Mrs. Wang living alone in the house? -Yes, although they have three sons, ________ of them live with their parents. [ ]
A.
neither
B.
both
C.
all
D.
none
【简答题】同义句转换，每空一词。 1. We have four weeks off. They have three weeks off. We have ______ ______ week off than them. 2. John runs faster than any other student in his class. ______ ______ in his class runs fas...
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