单项选择题

螺栓 GB/T5782 M12×80代表螺纹规格d= 。

A．M12
B．80
C．57
D．82

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对于有害垃圾，按照便利、快捷、安全原则，设立专门场所或容器，对不同品种的此类垃圾进行分类投放、收集、暂存，并在醒目位置设置标志。（）

答案： A.对(正确答案)
B.错

单项选择题

Which of the following statements is not correct?()
A、After the disturbance during the Southern and Northern Dynasties, China was reunified by the Sui Dynasty.
B、Zu Chongzhi introduced the approximation to π which is correct to 7 decimal places.
C、The system of “Three Departments and Six Ministries” was set up to strengthen the central authorities during the Tang Dynasty.
D、The Grand Canal from Beijing to Hangzhou was constructed during the Sui Dynasty.