一个快速的水管解耦许可证扫描探针显微镜- d21运作，在水管平行没有额外的外部保护继电器。
A quick mains decoupling permits the SPM-D21 to operate in mains parallel without additional external protection relays.
排水管的位置是和墙平行的，这就意味着它不是在地面上的。
The drain is positioned parallel to the wall, which means they are not on the ground.
注水管和下籽管的下端固定在打孔器的两平行孔内，上部由联接片相联；
The lower ends of the water filling pipe and the seed discharging pipe are fixed in the two parallel holes of the perforator, and the upper parts are connected by connecting sheets.
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