Remembering names is an important social skill. Here are some ways to master it. Recite and repeat in conversation. When you hear a person’s name，repeat it. Immediately say it to yourself severa
Batteries can power anything from small sensors to large systems. While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much lar
的所有棱长均为2，D是SA 的中点，E是BC 的中点，则
绕直线SE 转一周所得到的旋转体的表面积为 
