Counterfeit pesticides are the result of market competition and illegal traders for profiteering, and ultimately the farmers who use fake and inferior pesticides. Some farmers who use fake and inferior pesticides do not achieve the expected results, resulting in reduced production; some may als ....

The following problems should be noted in the deep cleaning of stone: 1. Should be tested first. The 'diseases' of stone vary widely, for example, there are many types of deliquescent salts that form water spots. Therefore, we do not know the specific causes of smudges, we advocate sm ....

The role and use of portable X-ray machines can be understood. Contact hotline: Miss Wu 135901011025 Erlang God Imaging Equipment (Shanghai) Co., Ltd. ELS-100 high definition portable X-ray machine High frequency, low dose, high definition digital image output. It can be connected to a monito ....

Jc001.load('iframe') JIFrame.create({ 'url' : '/go.php?action=ads&iframeHeight=250&isIframe=1&key=%CD%BF%C1%CF&pos_id=jc001_news_detail_30&reqkey=1&style=margin%3A15px+15px+ 25px+0%3B+height%3A255px%3Bwidth%3A255px%3B+float%3Aleft%3B', 'heigh ....

The use of large-capacity equipment and frequency conversion equipment inside the power supply system has caused increasingly serious internal surges. We attributed it to the effect of transient overvoltage (TVS). There is an allowable range of power supply voltage for any powered device. Sometimes ....

There are many varieties of wheat herbicides , and their physical and chemical characteristics, action sites, and action principles are different. Therefore, the symptoms of phytotoxicity are also different, some are in the plant body, some are external, some are in the ground ....

1, low carrying capacity Compared with similar oil-lubricated bearings, the bearing capacity of gas-lubricated bearings is about 1 to 2 orders of magnitude lower. According to the bearing capacity per unit area, oil-lubricated bearings are generally (0.5 to 2) MPa, while gas-lubricated bearings ar ....