GSM规定：在工程上同频干扰保护比C/I应≧（）dB。
A.10
B.12
C.14
D.16
参考答案：B
There ______ a talk about science in our school next week.[ ]
A. be
B. have
C. is going to be
D. is going to have
pH测定
胃波
A．邻苯二甲酸氢钾标准液B．硼砂标准液C．A+BD．草酸三氢钾标准液E．磷酸盐标准缓冲液
