设A是一个n阶方阵,已知│A│=2,则│-2A│等于:()
A.(-2)n+1
B.(-1)n2n+1
C.-2n+1
D.-22
参考答案:B
女,37岁。痛经6年,体检发现盆腔包块。月经周期缩短,经期延长,经量多。GP32,放置节育器。妇科检查外阴 * * 正常,宫颈光滑,子宫后位,孕9周大。活动不好。右附件区可及囊实性包块,与子宫后方粘连。B超见子宫稍大,肌壁有多个低回声结节,右附件非纯囊肿。
治疗方案()
A.对症
B.口服避孕药
C.孕三烯酮
D.手术
E.取环诊刮术
根据句意及首字母提示在横线处填上恰当的单词,使句子意思完整,语法正确。
1. I try my best to learn English well. I don't want to let my parents d_______.
2. Dick is k ______ about geography. He has read many books and travelled to many diifferent places
around the world.
3. My best fricnd is very smart. She can always come up w_______ some good ideas.
4. You need a lawyer to r______ you in court.
5. Have you carried the box to the s_______? It's dangerous here.
6. Only ten studcnts came to the class because dll the r_______ of the students were sick.