单项选择题

Which of the following are money market instruments?
1 Certificate of deposit
2 Corporate bond
3 Commercial paper
4 Treasury bill A.
1, 2 and 4 only B.
1 and 3 only C.
1, 3 and 4 only D.
1, 2, 3 and 4

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单项选择题

筛下累积频率为0.5时对应的粒径称为（）。

A．众径
B．算术平均直径
C．中位径
D．几何平均直径