【单选题】在自控系统中不仅要求异步测速发电机输出电压与转速成正比,而且也要求输出电压与励磁电源同相位。相位误差可在( ),也可在输出绕组电路补偿。 A.输出回路中并电感进行补偿 B.励磁回路中并电容进行补偿 C.励磁回路中串电容进行补偿 D.输出回路中串电感进行补偿
【多选题】中国民用航空局管理体系设计为( )三级管理。
【单选题】女,23岁,停经56d,阴道流血7d,有阵发性腹痛,妇检:子宫如妊娠4个月大小,宫颈着色,宫口闭,双附件区均可扪及鸡蛋大肿块,尿hCG阳性。为明确诊断,首选的辅助检查为
【单选题】The great changes astonished every visitor to that city.
【单选题】The great changes of the city astonished every visitor to that city.
【判断题】离散化设计的特点是采样周期选择灵活,不需要考虑对象特性。
【单选题】在页面制作中,我们一般使用( )样式属性来定义div区块的外边距并实现水平自动居中。
【单选题】The shopkeeper gives every visitor _________ up-to-date magazine to introduce their new goods.
【单选题】VHF DSC值守机是一个( )接收机。
【单选题】听力原文:Every visitor to the country is overwhelmed by the kindness and charm of its people. What does the visitor feel about the kindness in the country?