钻具发生过载断裂,宏观断口上塑性变形较大,存在着明显的()现象。 ["A、胀大","B、颈缩","C、扭曲","D、弯曲"]
车辆弹簧采取()钢。 ["60Si2Mn","65Mn","T7A","GCr15"]
下列化学键中,容易形成玻璃的是:() ["A、离子键","B、共价键","C、金属键","D、极性共价键"]
高度分化的植物细胞在实验室培养条件下重新进入未分化状态,成为全能性细胞,这一过程称为() ["去分化","转分化","异常分化","体细胞重编程","核移植"]
对Z轴分辨率影响最大的是:() ["扫描视野","扫描范围","扫描层厚","图像矩阵","重建算法"]
简述存档资料的保存与交接。