A boy was born to a couple after eleven years of marriage. They were a loving couple and loved the boy very much. When the boy was around two years old, one morning the husband saw a medicine bottle
—___________ is it from here to Xing Yi Hotel ? —About twenty minutes’ walk. A. How far B. How long C. How often D. How soon
下列做法或说法正确的是 A．处理废水时加入明矾作为消毒剂可以除去水中的杂质 B
A wonderful idea ________ me that day when I met with a tough problem，. A. happened to B. occurred to C. seemed to D. compared to
已知向量，向量与向量夹角为，且． （1）求向量； （2）若向量与向量的夹角为，向量，其中 为的内角，且．求的取值范围.
下图示意某地区年均温的分布，读图并结合所学知识，完成以下问题。 11．影响该地区年均温分布特征的主要因素是（ ） A．台风
如图所示电路由8个不同电阻组成，已知，其余电阻阻值未知，测得A、B间的总电阻为4．今只将换成6的电阻，则A、B间的总电阻变为________．
