如图所示,把A、B试管充分震荡后放入37℃的温水中,5分钟后取出并各加入2滴碘液,摇匀后观察到现象是( )
A:B试管中变蓝
B:A试管中变蓝
C:A,B试管中都变蓝
D:A,B试管中都不变蓝
________ fast. It's late for the meeting.
求sinα,cosα,tanα的值.