中肠袢
参考答案：
十二指肠以下的中肠起初为一直管，由于中肠的生长速度远比胚体快，使肠管向腹侧弯曲形成“U”形肠袢，称中肠袢，其顶端连于卵黄蒂。
Speaker A: What’s the rate for sending a package of books surface mail to Japan Speaker B: ().
A. Do you have any friends in Japan
B. 85 cents per pound, but the limit is 11 pounds per package if you want it to go book rate.
C. I’m afraid it will take about days for these books to reach Japan.
D. The rate for surface mail is cheaper than that for airmail, but surface mail takes longer.
压力变送器线性度指标差别太大，可以调电路板上（）
A、ADJUST
B、LINEA RADJUST
C 、SPAN
D、ZERD
