多发性子宫肌瘤，无生育要求（）
A．观察
B．经 * * 肌瘤摘除术
C．肌瘤切除术
D．子宫全切术
E．子宫全切加双附件切除术
参考答案：D
Being able to speak another language fluently is a great________when you are looking for a job. [ ]
A. assistance
B. chance
C. advantage
D. importance
矿用电气设备的隔爆外壳必须具有（）和（）性能。
