有限制钉的压力表在无压力时，指针转动后不能回到限制钉处时，压力表应停止使用。
参考答案：对
— What does the notice say?
— All the storytellers should meet at the same hall ________ won the first three prizes.[ ]
A. what
B. as
C. who
D. which
估算可编程控制器内存应考虑哪些因素？
