在修正薄膜厚度时,不应将油泵供油压力调整到最大工作压力下进行。
参考答案:错
一只蜜蜂和一辆汽车在平直公路上以相同的速度并列运动。如果这只蜜蜂眼睛盯着汽车车轮边缘上某一点,那么它看到的这一点的运动轨迹是下列哪幅图( )
A B C D
They _____ on the little professor, but it led to his fierce criticism on us. [ ]
A. played a joke
B. made fun
C. had fun
D. performed a joke