在青春期，异性同学间的交往要[ ] A．大胆开放，无需掌握分寸 B．远离集体，单

罗马共和国早期，只有习惯法没有成文法。公元前5世纪罗马成文法诞生，其标志是（　　）

A．习惯法的废除　　　　　　　　

B．《十二铜表法》的颁布

C．公平法的制定　　　　　　　　　

D．《民法大全》的编纂

Li Yue and Zhang Hua went to︿nursing home and did some voluntary work on May Day. At their arrival, they were warm welcomed. They presented the elderly people with flowers and fruits. Then, they started working at once, cleaning the windows and swept the floor. Everything done, they sit in the yard chatting with the elderly. When it was time for the volunteer to leave, the elderly thanked them for their kindness. Li Yue and Zhang Hua were very happy because of what they did bring joy to others. It also enriched our own experience. They made a promise which they would come again to see the elderly whenever they were free.

法兰连接由法兰、垫片和（）组成。

A、螺帽

B、螺栓

C、螺纹

D、螺柱

A．非常完善

B．过于严谨

C．缺少平等

D．压力太大

下列疾病中，不具有FDG-PET/CT检查适应证的是（）。

A.肺癌

B.结直肠癌

C.鼻咽癌

D.血管瘤

E.胰腺癌