单项选择题

一项发盘，经过还盘后，则该项发盘 A. 失效 B. 对原发盘人仍有约束力 C. 对还盘人有约束力 D. 在有效期内有效

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汗腺为（）。

答案：单曲管状腺

单项选择题

A resident physician is performing a pelvic examination on a young woman. The fingers of one of her hands are in the patient's vagina, planting the cervix. The other hand is pressing on the abdomen. With the palm of this hand,the physician feels a bony structure in the lower midline. This structure is most likely the
A、Pubis
B、Coccyx
C、Ilium
D、Ischium
E、Sacrum