直链烷烃的通式可用CnH2n+2表示，现有一系列芳香烃，按下列特点排列： 若用通式表示这一系列化合物，其通式应为： A．CnH2n-6 B．C6n+4H2n+
It’s said that Singapore is really a beautiful country. I’m considering _______ it. A. to visit B. visiting C. to visiting D. b
You can’t imagine what a great trouble they will have ___ the problems ___ now. A. to solve; being discussed B. to solve; to talk about C. solving; being talked about
一个做匀加速直线运动物体的加速度是3m/s2，这意味着（A）该物体在任1s末的速度是该秒初速度的3倍（B）该物体在任1s末的速度比该秒的初速度大3 m/s（
钚的放射性同位素静止时衰变为铀核激发态和粒子，而铀核激发态立即衰变为铀核，并放出能量为的光子。已知：、和粒子的质量分别为、和 （1）写
—What sort of house do you want to have? Something big? —Well， it be big—that’s not important. A.mustn’t B.needn’t C.can
世界上最大的岛屿是： A.台湾岛 B.海南岛 C.格陵兰岛 D.冰岛
的值为（ ）
B.
C.
D.
