數(shù)據(jù)庫錯誤: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'limit 1' at line 1]
select title from `demo_menu` where id= limit 1
數(shù)據(jù)庫錯誤: [Table 'my8907748842.demo_' doesn't exist]
SELECT title,keywords,description FROM `demo_` where id=1511
在果醬灌裝、火鍋底料定量添加等高溫工況中,傳統(tǒng)離心泵易出現(xiàn)密封失效問題。本文通過某調(diào)味品企業(yè)技改案例,揭示食品級蠕動泵的選型秘訣:
1. 確認(rèn)軟管耐受溫度(硅膠材質(zhì)建議選擇180℃以上)
2. 核查衛(wèi)生認(rèn)證(需具備FDA 21 CFR及3-A證書)
3. 計算實際輸送粘度(推薦使用Re<2000的層流設(shè)計)。特別提醒:選擇配備水冷機殼的型號可延長高溫環(huán)境下電機使用壽命,搭配稱重模塊可實現(xiàn)±0.5%的投料精度。