【单选题】The First National Bank of Hometown has excess reserves of $150. Assuming a required reserve ratio of 10%, the First National Bank can lend
【单选题】对称三相负载星形联结,若电源线电压为380V,线电流为10A,每相负载的功率因数为0.5,则该电路总的有功功率约为
【单选题】患者男, 32 岁,因右下腹突发性绞痛,血尿,诊断为输尿管结石,经输尿管镜取出尿酸结石。饮食应限制