变压器一次绕组一般用绝缘纸包的（）或铝线绕制而成。
A.绝缘
B.铜线
C.硅钢片
参考答案：B
用英语数字计算。
Eight + Two =
Four + Three =
Two + Four =
Three + Two =
Eight + One =
外周静脉穿刺时，止血带应在穿刺点（）cm
A.8
B.10
C.6
D.5
E.7
