二期梅毒的皮疹特点是:()。
A.斑疹
B.丘疹
C.斑丘疹
D.多形态
E.脓疱疹
参考答案:D
— Lisa hasn't lived here for long. She _____ know many people.
A.needn’t
B.can’t
C.shouldn’t
D.didn’t
什么是低周期反复加载试验?