一男性，15岁，时有腰背部疼痛、僵硬3月，休息时加重，其祖父患有强直性脊柱炎。经骶髂

对于逆流再生的阴床，原水中SiO/∑阴增大，其它条件不变，则阴树脂的工作交换容量将（）。

A.增加

B.降低

C.不变

Look! There is a crowd of people over there. Go and see what ________ and if it is a bargain, buy it. [ ]

A. has been selling  

B. has been sold

C. is selling  

D. is being sold

对话排序。

A. I guess I eat it two or three times a week.

B. Maybe twice a week. But I never eat fruit. I don't like it.

C. Yes, a little.

D. You're welcome.

E.  How often do you eat it?

F.  Do you like junk food?

G. OK, thank you for telling me.

H.  What about vegetables and fruit? 

_____________________________ 

背阔肌叙述错误的是（）

A．全身最大的扁肌

B．起自下6个胸椎棘突、腰背筋膜

C．起自下6个胸椎棘突、全部腰椎棘突、骶正中嵴、髂嵴后部

D．肌束向外上方集中

E．止于肱骨小结节嵴

关于激光相机优点的叙述，正确的是（）

A.分辨率高、动态范围宽

B.出片速度快

C.可选择多种分格、多份拷贝

D.密度和对比度单独调节

E.激光不会导致人体伤害