确定癌的主要组织学依据是A．恶性肿瘤细胞出血、坏死 B．恶性肿瘤细胞浸润周围组织 C

关于有核红细胞表述正确的是 （）

A.正常成人外周血涂片中偶见

B.1周之内婴儿血涂片中仅可见到少量

C.外周血涂片中出现常表示红系增生减低

D.巨幼红细胞贫血外周血涂片中罕见

E.急性白血病患者的外周血涂片中不会见到

老年人患骨质疏松，是骨中缺少   [ ]

A．蛋白质      

B．铁    

C．维生素C    

D．钙

海关对进出口货物收发货人在办理报关注册登记时实行______。

A．登记许可制

B．审批制

C．备案制

D．行政许可制

I live in the country and my father was a farmer.51. ______
He is now forty-five year old. Because of years of 52. ______
hard work, he looks old than his age. When I was53. ______
young, he is used to tell me the importance of study. 54. ______
Father knows little about English and other subjects, 55. ______
but he usually gives me some good advices on how56. ______
to learn my lessons good. He is not only kind to me 57. ______
but also very strict in me. With his help, I’ve made 58. ______
great progress. I’ll never to forget what he taught 59. ______
me. I think my father is best father in the world. 60. ______

发现运行中的电机超温冒烟后的正确处理方法是（）处理。

A.紧急停机

B.通知电工

C.先淋水降温

D.切换备用机