正常人外周血中干细胞只有骨髓中造血干细胞量的()。 ["1/100~1/10","1/1000~1/100","1/1000~1/10","1/1000","1/100"]
通过进路从何处起?到何处止?
耐洗色牢度测试中所用钢珠直径是() ["10mm","8mm","6mm","5mm"]
接车进路从何处起?到何处止?
设置弯起筋的目的,()的说法不确切。 ["满足斜截面抗剪","满足斜截面抗弯","充当支座负纵筋承担支座负弯矩","为了节约钢筋充分利用跨中纵筋"]
发车进路从何处起?到何处止?