外汇储备对货币供应量的影响主要取决于( )。
A.国际收支状况B.信贷收支状况C.财政收支状况D.进口与出口状况
参考答案:A
A number of students ______ playing on the ground but I don't know what the exact number______.
A.are; is
B.are; are
C.is; is
D.is; are
当发生液泛现象后,采取()的操作方法能减缓液泛。
A.提高塔底温度
B.减少回流比
C.提高进料量
D.减少塔顶采出量