【单选题】In countries where a solar calendar was adopted, the length of each year need to be ______ in order to have the same number of months in each year.
【单选题】下列说法中,正确的是 ( )(已知汽油密度为 0.8g/cm 3 )
【单选题】管理的( )是指管理是一定生产关系的体现,是为一定的生产关系服务的。
【单选题】如果劳动供给曲线几乎垂直,这意味着替代效应()。
【单选题】作润湿剂用的表面活性剂,要求其HLB值为
【简答题】Many outstanding applications are turned down each year for ______.