若,,,则的大小关系为 ( ) A. B. C. D.
Every morning, Mrs. Smith listens to the latest news _______ the radio. A. on B. with C.
如图,四棱锥P-ABCD中,AD⊥平面PAB,AP⊥AB. (1)求证:CD⊥AP; (2)若CD⊥PD,求证:CD∥平面PAB;
如果等差数列的前 5 个偶数项的和等于 15,前三项的和等于 -3,则 a1 = ,d = .
关于温度、热量和内能,下列说法错误的是 ( )A.温度高的物体内能一定大,温度低的物体内能一定小B.物体的内能
Laptop computers are popular all over the world. People use them on trains and airplanes, in airports and hotels. These laptops connect people to their workplace. In the United States today, laptops
选出下列成语运用正确无误的一项:( ) A.他们疼爱孩子,孩子也孝敬他们,一家人相敬如宾,生活美满幸福。 B.台湾前领导人陈水扁因洗钱和贪
课文的两个部分之间,是如何过渡的?把这些话找出来,说说是怎样起过渡作用的。 答:________________________________________________