下列哪项不属于阿尔茨海默病的病理表现（）
A.老年斑
B.神经原纤维缠结
C.颗粒空泡变性
D.Lewy小体
E.胆碱能神经元丢失
参考答案：D
He ______ busy yesterday, or he ______ you with your experiment.
A．was; had helped
B．was, would have helped
C．had been; would have
D．were; would have helped
设备检修分哪几类？
