学习宋元历史后，某班四位同学作了 如下主题演讲，你认为能准确概括这段历史的基本特征的是 A．国家产生和社会变革 B．
Cao Min couldn’t believe she was experiencing exactly what she had seen years ago in the film “Titanic”. Cao and her two children from Anhui Province were traveling on board the “Liaoludu 7
After reading her writing, every teacher came to the ______ that she was a very careful and promising girl. A. opinion B. decision C. impression D. conclus
若京沪高速从上述地区穿过，工程人员必须考虑 A．高速公路施工过程防止诱发地震 B．保护植被，避免引发山洪或泥石流
如图所示，一粒子源位于一边长为的正三角形ABC的中心O处，可以在三角形所在的平面内向各个方向发射出速度大小均为v、质量为m、电荷量为q的带电
一辆摩托车能达到的最大速度为30 m/s，要想在3 min内由静止起沿一条平直公路追上在前面1000 m处正以20 m/s的速度匀速行驶的汽车，则摩托车必须以多大的
—Have you found anything wrong with your computer? —Yes,and I was about to give it up when an idea ______to me that it may be struck by some kind of virus. A.occurred B.happened
根据右图溶解度曲线，判断下列说法正确的是 A．t1℃时，甲的溶解度大于乙 B．t2℃时，甲、乙两溶液的溶质质量分数一定相等 C．t3℃时，将甲、乙的
的最大值为 （ ）
B．
C．
D．
