晶闸管元件运行结温范围较窄,正常结温在()范围内。
参考答案:60-90℃
with the size of the whole earth,the biggest ocean does not seem big at all. [ ]
A.When compared
B.When comparing
C.Comparing
D.While comparing
用公式R=(1+R1)(1+R2)…(1+Rn)-1计算的收益率为()。
A.时间加权收益率
B.算术平均收益率
C.几何平均收益率
D.简单净值收益率