实施多元化经营战略的形式有()
A.纵横多元化
B.纵向多元化
C.水平多元化
D.多向多元化
参考答案:B, C, D
循环流化床锅炉空气预热器漏风的原因有哪些?
When father was young, he()from morning till night.
A.was made work
B.was made working
C.made to work
D.was made to work