期货经纪公司建立和完善内部控制机制的原则包括()。
A.健全性原则
B.有效性原则
C.合理性原则
D.相互制约原则
参考答案:A, C, D
已知f(x6)=log2x,那么f(8)=______.
Unlike Chinese, Americans their meals with knives and forks.[ ]
A. used to taking
B. are used to taking
C. used to take
D. are used to take