（1）将2.3g金属钠放入水中，要使100个水分子中溶有1个氢氧根离子，则需要水的质量为______。（2）已知7.6gA与9.6gB恰好完全反应，生成WgC和4.4gD。在相同
——Shall I inform him of the change of the schedule right now? ——I am afraid you ______, in case he comes late for the meeting . A.will B. can
Outside our hotel in Ho Chi Minh City, Vietnam, an old woman waited beside door with her hand outstretched．Every day I put my hand in hers as our eyes met．She never failed to__1__ smile, my grasp,
A、B两质点的运动情况如图所示，下述正确的是（）A．时，B质点运动方向发生变化B．时，A、B两点间距离一定等于C．A、B同时由静止出发，朝相反的方
The scene of the small village ______ my childhood memories .A.called on B. called up C. called in D.called back
若实数满足不等式组则的取值范围是 A. B. C. D.
下图中各城市的大气最大降温高度（距地面高度），是连续三年中最强的15次冷空气影响的统计平均值。读图回答20～21题。 20. 据图反映的变化趋势，
如图所示，电阻R1、R2、R3的连接方法是__________（填“串联”或“并联”），电流表A1是测量__________的电流。电流表A2是测量__________的电流。
