下列图形中，不一定是轴对称图形的是[ ]
A．线段
B．角
C．菱形
D．平行四边形
答案：D
You have made a few spelling mistakes in your composition, but it is well written _____.[ ]
A. on a whole
B. as a whole
C. general speaking
D. as the whole
软件企业应建立哪些合同规范？
