皮带的跑偏特点是跑紧不跑松，跑低不跑高。
参考答案：错
月经过多、消化道溃疡等慢性失血性贫血，营养不良，妊娠，儿童生长期的首选口服药物为
A．叶酸B．维生素B12C．重组人红细胞生成素D．粒细胞集落刺激因子E．FeSO4
— Could you tell me what happened?
— I'm not going to tell you about it, it's ________.[ ]
A. uncertain
B. enormous
C. perfect
D. private
