D:某溶液生成无色气体,说明原溶液中有CO32-
C:某溶液生产蓝色沉淀,说明原溶液中有Cu2+
A:某溶液生产白色沉淀,说明原溶液中有Cl-
B:某溶液生产白色沉淀,说明原溶液中有SO42-
如图所示,物体A、B用细绳与弹簧连接后跨过滑轮.A静止在倾角为45°的粗糙斜面上,B悬挂着.已知mA=3mB,不计滑轮摩擦,现将斜面倾角由45°减小到30°,那么下列说法中正确的是( )
After seeing children die of malaria(疟疾) in Hainan Island, Tu Youyou decided to c____ her life to the research.