需要电动机反转时，只将开关手柄扳到相反位置即可实现反转。（）
参考答案：对
计算：（-5）×（-7）-5×（-6）
Spring Festival is coming. I _________ tomorrow. [ ]
A. am sending a postcard for you
B. am sending a postcard to you
C. send a postcard for you
D. send a postcard to you
