铁剂治疗缺铁性贫血,其疗效指标最早出现的是()
A.血红蛋白上升
B.红细胞数上升
C.红细胞平均体积增大
D.网织红细胞数上升
E.红细胞平均血红蛋白浓度上升
参考答案:D
如图所示,足够长的水平传送带以2m/s的速度匀速运行,将一质量为2kg的工件轻轻放在传送带上,工件与传送带之间的动摩擦因数μ=0.2,则工件在5s内的位移是多少?摩擦力对物体做的功是多少?
Which of the following index represents small-company stocks
Which of the following index represents small-company stocks A.The Dow Jones Industrial.B.The Russell 2000.C.The Wilshire 5000.D.The S&P 500.
A.The Dow Jones Industrial.
B.The Russell 2000.
C.The Wilshire 5000.
D.The S&P 500.