子宫脱垂的主要原因为卵巢功能衰退。缺乏雌激素导致肌肉筋膜及韧带张力减退。
参考答案：错
—There aren't enough snacks for the party. Did you buy ______?
—No, I didn't. I bought everything they had in the shop. [ ]
A. little
B. less
C. more
D. most
BM500-02漏电探测仪探测频率范围为（）。
A.20～100HZ
B.30～60HZ
C.100～200HZ
D.150～240HZ
