地面气象观测场各仪器设施东西间隔不小于3 m，南北间隔不小于4m，仪器距观测场边缘护栏不小于4m。
参考答案：错
Since you are in a public place, the noise of your radio must be ______ to a level that we all feel comfortable with.
A．supposed
B．allowed
C．attached
D．limited
切割印刷缝合机组对印刷好的编织袋进行（）计数，到达设定值后报警提醒。
A.红外
B.光敏
C.光电
D.转轮
