悬挑脚手架脚手板铺设应符合哪些要求（）。
A、铺设严密
B、铺设牢同
C、有探头板
D.材质符合要求
参考答案：C, D
以下关于多形日光疹临床表现的描述正确的有（）。
A.一般发生于春季和夏季
B.好发于曝光部位
C.皮损呈多形性
D.一般无自觉瘙痒
"It was fortune that paid me a visit ____," said the modest professor at the award ceremony. [ ]
A. by mistake
B. by chance
C. in order
D. in place
