工程上无线覆盖规划中常用的传播模型有()。
A.OMEnurbHata模型
B.Okumura模型
C.COST231•Hata模型
D.Egli模型
参考答案:A, B, C, D
One advantage of using price-to-book value multiples for stock valuation is that:()
A. most of the time it is close to the market value.
B. it is a stable and simple benchmark for comparison to the market price.
C. accounting standards for assets are always consistent across firms.
混凝土搅拌机一般工作()以后应进行一级保养。
A、50h
B、100h
C、150h
D、200h