控制飞机绕横轴转动的舵面是（）
A.副翼
B.方向舵
C.升降舵
D.扰流板
参考答案：C
We have got plenty of time left to get the work finished so _______. Don’t go too hard at it. [ ]
A. take it easy
B. take time
C. don’t hurry
D. don’t worry
肖氏硬度标度
