累及头皮的寻常型银屑病，下列特征不正确的是（）
A.皮损境界清晰
B.最常累及发际缘
C.覆厚积的银白色鳞屑
D.造成永久脱发
E.束状发
参考答案：D
—I ______ for you for two hours, but in vain. Where did you go?
—I ______ at my uncle’s.
A．had looked; may have stayed
B．looked; must have stayed
C．have looked; may be staying
D．looked; must be staying
C80型车装用的人力制动装置为（）。
A、脚踏式制动机
B、卧式手制动机
C、掣轮式手制动机
D、链式手制动机
