▲+◇+◇=7,▲=( );▲+▲+▲+◇+◇=13,◇=( )
A:▲=3,◇=2
B:▲=3,◇=4
The dictionary as well as the grammar books that ________ bookmarks in them ________ Jane.
读《童年》,外祖母从猫嘴里救下一只____并教他说话,可是外祖父却不喜欢他,因为他老是____。
如果闭合电路中电源的电动势为12V,外电压为10V,当有0.5C电荷量通过电路时,下列结论正确的是( )