X线机对接地电阻的要求是()
A.小于8Ω
B.小于71Ω
C.小于6Ω
D.小于5Ω
E.小于4Ω
参考答案:E
_____ boys, you can buy pants for only $ 7 each! [ ]
A. At
B. On
C. In
D. For
下列哪种脉象不属于真脏脉()
A.釜沸脉
B.屋漏脉
C.躁疾脉
D.解索脉
E.雀啄脉