临床死亡期的特征是

A．神志不清

B．循环衰竭

C．呼吸衰竭

D．各种反射消失

E．肌张力丧失

As some countries attempt to shift away from natural gas or petroleum energy systems toward coal-based systems, the need for coal slurry(煤泥) will increase in these countries,（）transport mode will be the first choice for transfer this kind of product.

A.Water carriage

B.Pipeline transport

C.Rail transport

D.Surface transport