风险解析法,也称风险( )法。
A.结构分解 B.集中约束 C.合理规避 D.交互变更
参考答案:A
电喷雾质谱为()
A.FD-MS
B.EI-MS
C.FAB-MS
D.LSI-MS
E.ESI-MS
—Why are they so noisy?
—They are arguing about which TV programmes ______.
A. they watch
B. to watching
C. to watch
D. will watch