与小肠吸收营养物质无关的结构特点是(    )A.小肠长约5~6米    

与小肠吸收营养物质无关的结构特点是(    )

A.小肠长约5~6米                  B.小肠黏膜表面有许多皱襞和绒毛

C.小肠壁内有肠腺,分泌肠液         D.小肠绒毛中有毛细血管和毛细淋巴管

 

答案

C

解析:略

 

相关题目

 一列车的制动性能经测定,当它以标准速度20m/s在水平轨道上
 一列车的制动性能经测定,当它以标准速度20m/s在水平轨道上行驶时,制动后需40s才停下,现这列车正以20m/s的速度在水平轨道上行驶,司机发现前方180m处一
阅读下面作品,完成1一4题 红松擎天 张抗抗        ①伊
阅读下面作品,完成1一4题 红松擎天 张抗抗        ①伊春城像一个巨大沙盘,隐现在苍翠的林海中,红黄蓝白,色彩缤纷。        ②30多年前,
Nowadays many people make their choices about what they buy ,_______ advertis
Nowadays many people make their choices about what they buy ,_______ advertisements rather than their own judgment.   A. basing on  B. based on     C. to base on          D. was
车辆在行进中,要研究车轮的运动,下列选项中正确的是(
车辆在行进中,要研究车轮的运动,下列选项中正确的是( )    A.车轮只做平动       B.车轮只做转动       C.车轮的平动可以用质点
 The rich man gave away 5 _____ his money to charity to help the poor children
 The rich man gave away 5 _____ his money to charity to help the poor children in Africa.    A. millions     B. million       C. millions of     D. million of 
已知向量,,则向量在向量方向上的投影为          .
已知向量,,则向量在向量方向上的投影为          .
设数列{an}是公差不为零的等差数列,Sn是数列{an}的前n项和,
设数列{an}是公差不为零的等差数列,Sn是数列{an}的前n项和,且S32=9S2,S4=4S2,求数列{an}的通项公式.
President John Kennedy was a reader and writer.President Lyndon Johnson was a
President John Kennedy was a reader and writer.President Lyndon Johnson was a listener.President Johnson didn’t do as well as he could in the White House because he thought he had to follow Kenn

最新题目