只根据电解水的实验结果，还不能得出的结论是（ ） A．水由氢、氧元素组成 B．水分子由氢、氧原子构成 C．通电条件下，水能发生分解反应 D．一个
将体积比为1：2的四氯化碳和碘水在试管中充分混合后静置，下列图示现象 正确的是 A. B.
—Jim isn't in the classroom. Where is he?—He ________ to the teacher's office. A．will go B．has goneC．had g
I remembered that cloudy day when I was 17 and ran barefoot down the path to the mailbox.When I saw my SAT score，I sank into the grass and cried.I got a 1，090.Back then，in 1985，the highest
中国全民族抗战开始于 A．九一八事变 B．一二八事变 C．七七事变 D．华北事变
鱼呼吸时水流的方向是 A．先从口入，后从鳃盖后缘流出 B．先从鳃盖后缘入，后从口流出 C．先从口入，后从口流出
下图中的图形绕虚线旋转一周，可得到的几何体是（ ） A． B． C． D．
It doesn't matter when or how much a person sleeps, but everyone needs some rest to stay alive. That's what all doctors thought, until they heard about Al Herpin. Al Herpin, it was said, never slept
