子宫肌瘤于妊娠期或产褥期容易出现
A．脂肪性变B．囊性变C．红色变D．钙化E．肉瘤样变
参考答案：C
Give them a hand this time and I am sure they will offer theirs ______ in the future.
A．by turns
B．in turn
C．at turn
D．in return
请在如图中画出力F1、F2的力臂，并标明L1、L2．
