正如@ChristopherMoore评论的那样，Firestore不可能在多个字段上使用OR条件。执行单独的查询并在客户端合并...
我已经使用这个和它的工作...下面的代码块根据特定条件从名为“templates”的Firestore集合中检索数据。文...
a利用步进电机状态信号按钮给出正转或者反转,让单片机利用脉冲信号来改变电机通电相序,从而实现电机的正反转 Using step-by-steps the electrical machinery condition signaling key to give the clockwise or the reverse, lets the monolithic integrated circuit change the electrical machinery circular telegram ...
b.A state or condition marked by this feeling:living in constant fear of attack; saved as much as he could for fear of losing his job. 2.A feeling of disquiet or apprehension:a fear of looking foolish. 3.A reason for dread or apprehension:Being alone is my greatest fear. ...
a在防护工程设计中,我们依据地质条件及横断面填挖情况进行挡土墙设计,并选择适当的护坡形式 In the protection engineering design, we rest on the geological condition and the cross section fill in dig the situation to carry on the bulkhead design, and chooses the suitable slope protection form[translate...
My heart flutters with the privilege of imparting to you this miraculous tale. Oh how I’ve changed in a short period of time, but how did my mind manifest itself before my mystical transformation? Similar to typical mediocre humans I conformed to the banality of life. I laugh now when ...
Hemodynamically unstable patients or those whose condition was the result of an underlying acute medical diagnosis were excluded. Data were analyzed by descriptive methods.Results: During the study period, 1,233 patients made 1,820 visits for atrial fibrillation or flutter to the ED. Of the 400 ...
(String city) async { final location = await _weatherApiClient.locationSearch(city); final woeid = location.woeid; final weather = await _weatherApiClient.getWeather(woeid); return Weather( temperature: weather.theTemp, location: location.title, condition: weather.weatherStateAbbr.toCon...
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The characteristics of individuals with myocarditis, pericarditis and cardiac arrhythmias in the 1–28 days postvaccination differed by condition and according to the vaccine administered (Table 2). Supplementary Table 1 shows the characteristics of patients who died for the individual outcomes in the...