读图完成各题。 图中甲、乙两水系的支流密度差异很大，主要影响因素是 A.地形 降水 B.纬度 地形 C.植
用酸性氢氧燃料电池电解苦卤水(含Cl－、Br－、Na＋、Mg2＋)的装置如下图所示(a、b为石墨电极)．下列说法中，正确的是 ( ) A．电池工
The weather turned out to be very good, _______ was more than we could expect. A. what B. which C. that D. it
能源、信息和材料是现代社会发展的三大支柱，关于它们，下列说法中正确的是（ ）A．光电池和VCD光碟都应用了磁性材料 B．超导体可用来做
The audiences’ reaction made it _____ that this play was a great success. A. evident B. familiar C. relevant D. skeptical.
图甲中的a是一个边长为为L的正方向导线框，其电阻为R．线框以恒定速度v沿x轴运动，并穿过图中所示的匀强磁场区域b，如果以x轴的正方向作为力的正
- The teacher accused me of cheating on the test. - Well, ________? You should have been honest. A．was he B．did he C．were you D．did yo
