维持子宫正常位置的主要韧带有________、________、________、________。
参考答案：子宫圆韧带｜子宫阔韧带｜子宫主韧带｜骶子宫韧带
We hope you _____ a happy holiday in Hong Kong. [ ]
A. to have
B. having
C. had
D. will have
蓄电池组通常装设的两只双向电流表各有什么用途？
