室内配电装置中，带电体至接地部分的安全距离为（）豪米。
A.10
B.20
C.30
参考答案：A
震中
The nurse is performing wound care. Which of the following practices violates surgical asepsis ？（）
A．Holding sterile objects above the waist.
B．Considering a 1" (2.5 cm) edge around the sterile field as being contaminated.
C．Pouring solution onto a sterile field cloth.
D．Opening the outermost flap of a sterile package away from the body.
