使用一次性用品属于
A．个人防护 B．无菌术 C．表面消毒 D．器械消毒 E．废物处理
参考答案：B
I soon found that the work I was doing had already been done by someone else.________, I was
wasting my time. [ ]
A. In other words
B. In a word
C. First of all
D. Believe it or not
与十进制数1023等值的十六进制数为______。
A．3FDH
B．3FFH
C．2FDH
D．3EFH
