当天然水中的总碱度<总硬度时,水中既有永久硬度,又有暂时硬度,而无钠盐碱度。()
参考答案:对
We are sorry to inform you that the shipment is not ______ the standard stipulated in the contract.
A.into B.up toC.according to D.instead of
3年期零息票债券的价格为( )元。
A.765.55
B.772.18
C.816.58
D.863.83