单项选择题
A. B. C. D.
分子链支化程度增加,使分子间距离增加,因此高聚物的拉伸强度增加
判断题分子链支化程度增加,使分子间距离增加,因此高聚物的拉伸强度增加
Which of the following can cause megaloblastic anemia? ...
单项选择题Which of the following can cause megaloblastic anemia? A、deficiency of iron B、deficiency of EPO C、deficiency of VitB12 D、deficiency of androgen