一个物体要在平面图上真实的反映它的尺寸,最少要有()视图。
A.2个
B.3个
C.4个
D.6个
参考答案:B
正方体的棱长扩大4倍,表面积扩大24倍.______.(判断对错)
At the meeting,we exchanged(交换) _______ in the study of English.[ ]
A. experiences
B. an experience
C. many experiences
D. experience