【判断题】Decentralized vacuum pump is suitable for filling machine internal space is not enough to install centralized vacuum pump, gasoline sales volume is not large gas stations.
【单选题】The power factor is a measure of the phase difference between voltage and current and is expressed as the_____ of the phase angle.
【单选题】婴儿,6个月。高热10余日,咳嗽,气促,其母患肺结核,体检:精神委靡,面色苍白,双肺呼吸音粗,肝肋下2.5 cm,脾触及边缘,前囟膨隆,颈强(±),OT 试验阴性,胸片:双肺中外带均有粟粒状阴影。OT试验出现阴性反应,最可能的原因为
【单选题】What is NOT mentioned about the solar backup system?
A.
It is easy to install.
B.
It requires little maintenance.
【单选题】6个月。婴儿,因发热、咳嗽、气促2天,诊断为支气管肺炎入院长。于病程第3天体温更高,抽搐2次,嗜睡进而昏迷。前囟稍隆起,巴氏征阳性
【单选题】With a purely resistance load the voltage and current are in phase, giving a power factor of _____.
【单选题】7个月婴儿,高热、咳嗽6天,气促3天,今日抽搐3次。已接种卡介苗。查体:体温39℃,脉搏180次/分,呼吸70次/分。处于昏睡状态,面色发绀,双目凝视。前囟稍饱满,双肺散在细湿罗音,肝肋下3.5cm,颈软,克氏征阴性,巴氏征阳性。血白细胞9乘以十的九次方/L,中性粒细胞0.35,淋巴细胞0.65。脑脊液:外观清,蛋白定性阴性,细胞数2乘以十的六次方/L,糖3.7mmol/L,氯化物118mmol/...
【单选题】Policies are also an important factor for the car market ______ the purchasing power of people.