现代企业变革的战略类型()
A.人员变革
B.技术变革
C.产品服务变革
D.战略结构变革
E.企业文化变革
参考答案：B, C, D, E
如图13-1-21所示,正弦波甲和方波乙的交变电流的峰值和频率相同,把此两电流通入阻值完全相同的电阻,则在相同的时间里(足够长)两电阻所消耗的电功之比W甲∶W乙为( )
图13-1-21
A．1∶2
B．1∶2
C．1∶1
D．1∶4
— Jack can't concentrate on his lessons recently.
— Yes, that might ____ why he did so badly in the last test.
A. answer for
B. apply for
C. account for
D. call for
