搜题请搜索小程序“爱下问搜题”
问题 单项选择题

有关食管的描述，错误的是

A．食管的第一个生理性狭窄位于咽食管交接处
B．食管的第二处生理性狭窄位于主动脉弓压迹水平
C．食管的第三处生理性狭窄在膈食管裂孔处
D．食管壁无浆膜层
E．食管的肌层上部为横纹肌，下部为平滑肌

答案

参考答案：B

解析：食管的第二处生理性狭窄位于与左主支气管交叉处。

补全对话，情景问答
为下列句子选择答语。
( ) 1. What's his name?
( ) 2. What colour is it?
( ) 3. How many apples?
( ) 4. Where's your book?
( ) 5. What's this?
( ) 6. How old are you?
( ) 7. What's your favourite colour?
( ) 8. How many books do you have?
( ) 9. What's your name?
( ) 10. How are you?		A. Fine, thanks.
B. I'm eight years old.
C. His name is Li Ming.
D. It's red.
E. My favourite colour is green.
F. I have two books.
G. Ten apples.
H. It's under the desk.
I. It's a red apple.
J. My name is Jenny.
查看答案
单项选择题

不属于安全技术范围的是（）。

A.保障职工安全

B.防止工伤事故

C.减轻劳动强度

D.劳动保护工作
查看答案