巷道腰线一般采用高于巷道底板或巷道轨面设计高程（）米。
A.0.5-0.8
B.0.8-1.2
C.1.0-1.5
D.1.2-2.0
参考答案：C
现代企业制度的核心是什么？
They did considerable work to ______ the masses of the United States with the elementary problems of Latin America.
A．allow
B．acquaint
C．notify
D．propagate
