如图所示四个演示实验中,能够说明电流的磁效应的是 [ ]
A.
B.
C.
D.
答案:D
When you sleep, you always keep your eyes ___________.[ ]
A. open
B. close
C. closed
D. opened
慢性间质性肾炎出现近端肾小管功能受损导致肾小管对钙的吸收减少,1,25(OH)2D3生成减少时,临床上不会出现的是()
A.低尿钙
B.高血钙
C.低尿磷
D.低血磷
E.以上均不是