I asked him _____we had to go .He told me just two more miles A. how much longer B．how much farther C．how long D．how far
（4分）某硫酸厂每天排放1万米3尾气（标准状况），其中SO2的体积分数为0.2%，用NaOH溶液，石灰及O2处理后，假设硫元素不损失，问理论上每天可得到多
We are supposed to____ movie characters for the party. What a novel idea! A. dress in B. dress up in C. dress up with D. dress up as
—What’s the matter,Ann?You look sad. —Oh,nothing much.As a matter of fact,I of my friend back home. A.thinkB.have just thought C.had just thought D.was just thinking
It was reposed by the foreign media that the 29th Beijing Olympic Games was unique and successful event in Olympic history． A a；不填 B．the；the C．不
已知数列满足：，且, （Ⅰ）证明：数列为等差数列； （Ⅱ）令，求数列的前n项和.
汽车在平直公路上以速度v0匀速行驶，发动机功率为P。快进入闹市区时，司机减小了油门，使汽车的功率立即减小一半并保持该功率继续行驶。如图四
