弯制卡环的卡环臂要求具有
A.水平和垂直两个方向的弯曲B.单方向半圆形弯曲C.单方向水平弯曲D.单方向垂直弯曲E.水平和斜向两个方向弯曲
参考答案:A
Li Wei with his friends _______ work on the farm next week. [ ]
A. goes to
B. go to
C. are going to
D. is going to
蟑螂的栖息习性有哪些?