下列计量器具的检定结果，检定合格后直接使用的是（）。
A.天平
B.秒表
C.大气压力计
D.温度计
参考答案：A, B
Although you have travelled to many scenic spots before, ________ of them are as attractive as the one
I visited this summer vacation.[ ]
A. any
B. none
C. neither
D. all
何谓四季平色？其形成原因如何？
