A1 题型 猩红热最常见的并发症是
A、肺炎
B、脑膜脑炎
C、风湿病
D、胰腺炎
E、睾丸炎

单项选择题Crank OA rotates with angular velocity w and angular acceleration α. The accelerations are drawn in the figure if point A on crank OA is chosen as the moving point and the moving reference frame is attached to the T-shaped member. Which equation is correct according to the theorem of composition of accelerations?

单项选择题A． B． C． D．