题目

—Thank you for your CD-ROM.I’ll return it as soon as possible. —___________.I’ve got another one to spare. A.No problem               B.No hurry C.Nothing much            D.Be careful 答案：B 解析: No hurry 别急,别这么着急。用惰性电极电解2mol/L的NaCl和1mol/L的MgSO4混合液时，下列曲线合理的是A. B. C. D.