男，6岁，临床需查骨龄。应首先选摄何部位X线片（） A.膝关节正位 B.踝关节正位

已知两圆的圆心距O₁O₂为3，⊙O₁的半径为1，⊙O₂的半径为2，则⊙O₁与⊙O₂的位置关系为______．

I was used to be the shyest person in the world. I often hide behind my mother whenever there came a visitor. When asking to speak in class, I could hard breathe. Then in the seven grade, I had a new English teacher, Miss Creen. One day, he asked me a question but I didn’t know the answer of it. I stood there, not knowing what to say. Learning that I was a shy person after class, she gave me some advices. She said, “Remember to smile after doing everything, and you’ll feel good about yourself.” Now I’m not a shy person. With smile, I can meet people without being afraid.

以下会计档案属于永久保存的是（ ）

A．总账

B．日记账

C．银行存款对账单

D．年度财务报告

不适于与其他注射剂配伍的注射液是

A．5%葡萄糖注射液

B．甘露醇注射液

C．氯化钠注射液

D．氨茶碱注射液

E．氯霉素注射液

成本性外汇管制是指国家外汇管理机构对外汇买卖的数量直接进行限制和分配，旨在集中外汇收入，控制外汇支出，实行外汇分配，以达到限制进口商品品种、数量和国别的目的。