由一般物价水平的不确定变动而使人们遭受损失的可能性是()。
A.国家风险
B.购买力风险
C.市场风险
D.经营风险
参考答案:B
There are _________of nurses in our school but only _______of them are boys.
A. hundreds, three hundred.
B.hundred, three hundreds
C. hundreds, three hundreds.
D.hundred, three hundred
0.38kv线路导线对地面的最小允许距离是多少?