问题如下图：
选项：
A. 
B. 
C. 
老师问下A为什么错了呢 打破上升趋势 那不是要准备下降了吗
解释：
NO.PZ2018062001000026 Breacheresistanlevels become support levels. Trenreverswhen short-term moving average is crossing the long-term moving average. B is correct. Change in polarity incates thbreacheresistanlevels become support levels anbreachesupport levels become resistanlevel.谢谢谢谢。完全不懂哪个知识点。
老师 这里考察哪个知识点？
