“过淡区”是指（），属安全区。A、氧气太少 B、含碳氢气浓度低于爆炸下限 C、含混合

The little boy was the only one who _____ the earthquake in his village, and the

government sent him to a city school after that. [ ]

A. experienced

B. escaped

C. survived

D. suffered

下列哪一个频率计权网络可以模拟人耳听觉对低频不敏感的特征?

A.A计权

B.B计权

C.C计权

D.D计权

党的十八大提出新形势下人民军队的两大战略任务是（）

A.拥军优属、拥政爱民

B.巩固国防和强大军队

C.打得赢、不变质

D.坚强战备、服务经济建设

挖掘机触电时应急措施有哪些？

由多种精致的植物花粉和乳糖制得的营养保健花粉制品