【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.
【判断题】4标准离差率是用标准离差同期望报酬率的比值,可用于比较期望报酬率不同的各项投资的风险程度,标准离差率越大,风险就越小。
【简答题】FIATA hold a World Conference each year.
【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 ______.