动脉粥样硬化的形成与下列哪些因素有关()
A．高胆固醇血症
B．吸烟
C．高血压
D．糖尿病
E．肾病综合征
参考答案：A, B, C, D, E
一波源在左绳端发出半个波①,频率f1,振幅A1;当此波源刚起振时绳 右端的另一波源也恰好起振,发出半个波②,频率f2(f2>f1),振幅A2,P为绳的中点,如图所示.下列说法错误的是( )
A．两列波同时到达P点
B．两列波相遇时P点波峰值可达到A1+A2
C．两列波相遇再分开后,各处保持原波形传播
D．因频率不同,这两列波相遇不能叠加
The result is not the same ____they had expected, _____ was rather disappointing. [ ]
A. as; which
B. as; that
C. that; as
D. which; as
