1. The installed aluminum alloy doors and windows should be closed tightly with uniform gap; the parallelism between the door and window fan and the frame or the adjacent edge of the adjacent fan should not exceed 2 mm. Be flexible and use it freely.
2, sliding doors and windows, see if the glideslope is installed flat, pay attention to not bump, gently push the doors and windows, should slide freely.
3. The vertical frame and horizontal frame of the balcony aluminum alloy window must be firmly fixed on the balcony railing and the top of the balcony. Generally, it is fixed in the concrete by nails or rivets, and the angle steel reinforced by painting is used for fixing. Can not be fixed on the brick wall, can not use a wooden wedge up and down the vertical stand instead of nail gun fixed. The gap between the upper glideslope and the top guardrail should be filled with cement mortar to prevent rainwater from pouring into the room.
4. The wall thickness of the aluminum alloy window profile should not be less than 1.4 mm, and the wall thickness of the door profile should not be less than 2 mm. The thickness of the connection between the aluminum alloy door frame and the wall shall not be less than 1.5 mm.
PCR instrument, also known as DNA thermal cycler and gene amplification instrument, is the basic laboratory instrument.
The PCR instrument is mainly used in many fields such as basic research and applied research, such as genetic analysis, sequence analysis, evolutionary analysis, clinical diagnosis, forensic medicine, and so on. With the continuous development of molecular biology, PCR amplification technology has also been popularized and applied.
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