G．人员比对
A．室间量值比对
B．值比对 F
C．样品检测
参考答案：A,B,C,D,E,F
19. It is reported that China has created the first man-made sun in the world recently, ______ ?
A．isn’t it
B．is it
C．hasn’t it
D．has it
励磁调节器的灭磁装置由哪几部分组成？
