三角形按角可以分为（ ）三角形、（ ）三角形和（ ）三角形。
锐角；直角；钝角
—Let's play ping-pong.
—_____ Let's go. [ ]
A. I don't have a ping-pong bat
B. That sounds boring
C. Sorry, I don't like it
D. That sounds great
哪些调车作业应进行试拉？
