— What is your favorite color?
— ___________________.[ ]
A. It's a snake
B. It's green
答案:B
±500kV直流线路与公路交叉时,导线到1~3级公路路面最小距离不应小于( )。
A.10.0m; B.12.0m; C.14.0m; D.16.0m。
胃运动的形式有哪几种?受哪些因素的调节?