外汇市场的交易层次包括()。
A.商业银行与客户之间
B.商业银行同业之间
C.中央银行与客户之间
D.商业银行与中央银行之间
E.中央银行与中央银行之间
参考答案:A, B, D
Joe works two part time jobs. One week Joe worked 8 hours at one job, earning $150, and 4.5 hours at other job, earning $90. What were his average hourly earnings for the week ?()
A.$8.00
B.$9.60
C.$16.00
D.$19.20
E.$32.00
压缩机润滑油系统压力下降的可能原因是()。
A.润滑油温度高
B.润滑油温度低
C.润滑油变质
D.油路或油过滤器堵塞