PH值等于7的土壤属于（）土壤。
A.中性
B.强酸性
C.微酸性
D.微碱性
参考答案：A
— Why didn't you buy the camera you had longed for?
— I had planned to. But I was ￡50 _____. [ ]
A. fewer
B. less
C. cheap
D. short
R，X1，Xc串联电路中，已知电源电压有效值U=220V和R=X1=Xc=400Ω，则电路中的电流为（）
A.0
B.0.25
C.0.5
D.1
