(下列各题共用备选答案) A．使君子 B．雷丸 C．南瓜子 D．贯众 E．苦楝皮 宜炒香嚼服的是 A.丹毒###SX

计算CaC2O4在pH=3．0、C(C2O42-)=0．010mol.L-1的溶液中的溶解度。已知Ksp(CaC2O4)=2．32×10-9H2C2O4的解离常数为：Ka1=5．6×10-2，Ka2=1．6×10-4。 点击查看答案

Which of the following factors does the author believe are very important in developing friendships?A．Age and backgroundB．Economic and social positionsC．Race and looksD．Same interests and behavior 点击查看答案