慢性单纯性苔藓的好发部位是（）。
A.躯干及四肢伸侧
B.腰骶部
C.颈部及眼睑处
D.头面部
E.头顶部
参考答案：C
America was _____ by Columbus while the electric lamp was _____ by Edison.
A. invented; discovered
B. discovered; invented
C. found; invented
D. found; discovered
钨的熔点是3 410 ℃，那么在3 410 ℃ 时钨处于下面哪种状态（ ）
A．固态
B．液态
C．固液共存态
D．以上三种情况都可能
