The plane must be ready within ten minutes. There should be no ______ in sending the blood to the injured

people.[ ]

A. hurry

B. delay

C. time

D. wait

缺少下列哪类无机盐时，容易出现浑身乏力、头晕等贫血症状[ ]

A．含钙的

B．含磷的

C．含铁的

D．含碘的