全血在保存过程中,发生了“保存损害”,增加了一些有害物质,其中有()
A.钾
B.钠
C.钙
D.铁
E.镁
参考答案:A
Please do the exercises as _______ as you can in the English exam. [ ]
A. well
B. good
C. better
D. best
整体地面,水泥混凝土采用的粗骨料,其最大粒径不应大于面层厚度的()
A.1/3
B.1/2
C.2/3
D.1