有支持作用的卡环是
A．工杆
B．只有弹性固位臂的单臂卡环
C．双臂卡环
D．隙卡
E．以上都是
参考答案：D
食管贲门失弛缓症的典型X线表现是（）
A.食管下端不规则狭窄
B.食管蠕动减弱或消失
C.食管下端鸟嘴样或漏斗狭窄
D.钡剂通过缓慢
E.食管极度扩张
Liu Qian, a magician from Taiwan, ______audience of thousands on the CCTV Spring Festival Show.
A．appealed to
B．applied for
C．approved of
D．appointed with
