在计算铆钉的挤压面积时,是按()计算的。
A、圆柱面
B、半圆柱面
C、铆钉直径
D、铆钉直径与板厚为边长的矩形
参考答案:D
—What does your friend look like?
— .
A .He is tall. B. She is a kind girl.
C .She likes music. D She has good looking.
实施观察要注意看、听、问、思、记等互相配合,达到最佳效果。