肠套叠的促发因素是()
A.饮食改变
B.腹泻
C.病毒感染
D.肠息肉
E.以上都是
参考答案:E
It was ________ very rare find and the archaeologist who made ________ discovery said it was like unearthly a Mona Lisa.
A.a; the
B.the; the
C.the; a
D.a; a
诊断阶段
A.一核包囊B.滋养体C.二核包囊D.四核包囊E.滋养体和包囊