【判断题】瞬时功率在一个周期内的平均值,称为平均功率。
【单选题】以下不适用手工压卡进行交易的银行卡是()。
【单选题】Some minerals have complex chemical (compositions).
【判断题】Alibaba was founded in 1999 by Ma Huateng. Jack Ma, originally an English teacher in Hangzhou, established his e-commerce company with a team of 18 people.
【单选题】Some minerals are quite common, others are regionally _________, and still others are rare on the earth.
【单选题】具有信用消费、转账结算、存取现金等功能的信用卡是()。
【单选题】题2~3:某受拉木构件由两段矩形截面干燥的油松木连接而成,顺纹受力,接头采用螺栓木夹板连接,夹板木材与主杆件相同;连接节点处的构造,如图4-17所示。该构件处于室内正常环境,安全等级为二级,设计使用年限为50年;螺栓采用4.6级普通螺栓,其排列方式为两纵行齐列;螺栓纵向中距为9d,端距为7d。 当构件接头部位连接强度足够时,试问该杆件的轴心受拉承载力(kN),与下列何项数值最为接近?
【判断题】In 1620, a number of Puritans went to settle in Virginia.
【单选题】银行卡包括信用卡和借记卡。信用卡按()分为贷记卡、准贷记卡两类。