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【单选题】
改良Heller术的手术要点不包括A.
切断食管下段一侧所有环行肌纤维
B.
贲门部食管肌层切开长度不超过2cm
C.
食管下段肌层切开长度至少8～10cm
D.
常规做胃底折叠术以防胃-食管反流
E.
术中应注意勿损伤胃-食管返折
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】60Si2MnA is a kind of ( ), its Si content is ( ), its Mn content is ( )
A.
alloy structural steel or alloy spring steel, <2%, <1%
B.
high strength low alloy steel, <2%, <1%
C.
alloy structural steel or alloy spring steel, between 1.5% and 2.49%, <1.5%< /div>
D.
high strength low alloy steel, between 1.5% and 2.49%, <1.5%< /div>
【单选题】Constant smiling without apparent reason ______.
A.
is a sign of one's friendliness
B.
is a sign of one's unfriendliness
C.
makes people feel happy
D.
makes people feel uncomfortable
【简答题】镜头有哪些基本构成?分别起到的什么作用?
相关题目：
【单选题】60Si2MnA is a kind of ( ), its Si content is ( ), its Mn content is ( )
A.
alloy structural steel or alloy spring steel, <2%, <1%
B.
high strength low alloy steel, <2%, <1%
C.
alloy structural steel or alloy spring steel, between 1.5% and 2.49%, <1.5%< /div>
D.
high strength low alloy steel, between 1.5% and 2.49%, <1.5%< /div>