垂体微腺瘤是指肿瘤直径（） A.≤5mm B.≤10mm C.≤15mm D.≤20

_____ a US visitor visa twice, the young man finally gave up his hope of going to America. [ ]

A. Having been refused

B. Being refused

C. Having refused

D. To be refused

在乳腺癌半野切线等中心定位时，转动机架使内外切野的两根铅丝和射野重叠，一般切肺为（）

A.0.5cm

B.1cm

C.1.5～2cm

D.2.5～3cm

E.3.5cm

给予公务员处分的条件是什么？

谈谈王莽的“托古改制”以及效果。