坝内水平截面上的剪应力τ呈三次抛物线分布。()
参考答案:错
The other day ,my father drove his car at _____I thought was a dangerous speed.
A.as
B.that
C.what
D.which
男性,37岁,确诊为急粒细胞白血病,近2周出现发热,坐位站立时黑矇、头晕、极度乏力,急查血常规血红蛋白47g/L,纠正贫血快速有效的方法是()
A.补充铁剂
B.补充叶酸及维生素B12
C.输注全血
D.应用促红细胞生成素
E.输用浓集红细胞