四冲程柴油机气缸盖触火面常发生()裂纹。
A.径向
B.周向
C.A或B
D.A和B
参考答案:A
Learning experiences happen to us throughout our lives, and not too long ago, I had _______ that
I would like to share. [ ]
A. it
B. that
C. one
D. this
编制利润表。