将一个平行四边形拉成长方形,周长______,面积______
A.变大 B.不变 C.变小.
将一个平行四边形拉成长方形,周长不变,面积变大.
故答案为:B,A.
We don't know who ____ for the murder, but the policemen will tell us the truth soon.[ ]
A. is to blame
B. is to be blamed
C. is blaming
D. is to be blaming
通过检测电缆放电()的变化可间接检测出电缆的长度变化,从而计算出电缆断芯位置。