数控铣床主轴的轴向窜动主轴轴肩支承面（     ）边缘处，旋转主轴进行检验 A.
远离 B.
靠近 C.
对齐 D.
偏离

单项选择题关于肝小叶的结构，哪项错误A. 肝板两侧的血窦可相互通连B. 胆小管位于肝板之间C. 窦周隙与胆小管互不通连D. 相邻肝板相互吻合连接E. 中央静脉汇入小叶下静脉

多项选择题Why is the livestock industry so developed in Australia? A. It is favored by natural conditions. B. It has abundant groundwater resources. C. It is highly mechanized. D. It is due to its intensive grazing.