如图所示的电路,电源电压为12V 且保持不变。R1=10 Ω,R2是0 ~50 Ω的变阻器。求当变阻器滑片移动时,电流表、电压表的示数变化范围。
1.2~0.2A;12~2V
If human beings had been a bit less greedy and cruel, more birds and animals ______ dying out. [ ]
A. ought to avoid
B. could have been avoided
C. should have avoided
D. might have avoided
十一届三中全会作出的伟大决策是
A.确立了实事求是的思想路线
B.停止使用“以阶级斗争为纲”的错误口号
C.把党和国家的工作重心转移到经济建设上来,实行改革开放
D.拨乱反正