为检查,维修渗沟,宜设置检查井的地点有()。
A.路线平曲线焦点处
B.渗沟平面转折处
C.渗沟纵坡由陡变缓处
D.路线凸型竖曲线出
E.渗沟纵坡坡由缓变陡处
参考答案:B, C
用所给词的适当形式填空。
1. —What do you usually do on weekencls?
—I often do some _______ (read).
2. Here _______ (be) the results of the student activity survey.
3. _______ (drink) milk is good for our health.
4. I try _______ (eat) a lot of vegetables.
5. Good food and exercise help me _______ (study) better.
试述腹股沟管的位置、四壁和二口。