(2013)图示结构的两杆面积和材料相同,在铅直力F作用下,拉伸正应力最先达到许用应力的杆是:() ["杆1","杆2","同时达到","不能确定"]
千斤顶的起重量必须大于重物的重量。()
病毒() ["二分裂","复制","有丝分裂","裂解","出芽"]
《建筑施工高处作业安全技术规范》(JGJ80--2011)规定,电梯井口必须设防护栏杆或固定栅门,电梯井内应()设一道安全网。 ["每隔一层并最多隔5m","每隔一层并最多隔10m","每隔两层并最多隔5m","每隔两层并最多隔10m"]
成人每日内生水的量为() ["100ml","200ml","300ml","400ml","500ml"]
如何搭配财政政策和货币政策来克服“滞胀”。