关于梅毒硬下疳错误的说法是（） A.无痛 B.圆形或椭圆形单个溃_爱下问搜题

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问题单项选择题 A1/A2型题

关于梅毒硬下疳错误的说法是（）

A.无痛

B.圆形或椭圆形单个溃疡

C.覆棕黄色薄痂

D.触及如硬币或软骨样

E.病损内不含病原体

答案

参考答案：E

选择题

_______ a precious diamond necklace for his wife, Martin could hardly afford a tie for himself.

[ ]

A. Having bought

B. Buying

C. Being bought

D. To buy

判断题

控制阀出现故障需要修理时，应先关闭其上下游截止阀，然后打开副线阀。