It also looks at various ways of facilitating the ______ of practical applications beyond the "research tool" stage in satisfying the national needs of earth resource management of developing countries.

A．evolution

B．puncture

C．juncture

D．enforce

颏部正中粉碎性骨折造成窒息，首选的急救方法为（）

A.环甲膜切开

B.气管切开

C.牵引舌体至口外

D.吸氧

E.骨折复位