单相整流电路中,二极管承受的反向电压最大值出现在二极管()。
A.截止时
B.导通时
C.由导通转截止时
D.由截止转导通时
参考答案:A
根据所给汉语意思及文章内容,写出单词的正确形式。(每空限填一词)
Sandy is one friend of 小题1:(我的). She is one of the best 小题2:(志愿者)I have ever known. She is always ready to 小题3: (提供) help for people in need. Specially speaking, she likes to visit 小题4:(生病的) children in the hospital to cheer them up; she never minds 小题5: (募捐) money for those poor people; she never has problems 小题6:(借) money to his friends. She once told me:“Someone once saved my life. He asked me to 小题7:(传递) his love to your family, friends neighbors and even strangers. I followed him. Now, you can’t 小题8: (想象) how happy I am when helping those in difficult 小题9: (情况). ” Do you have the same 小题10: (精神) as Sandy? Do you want to join her?
患者男性,62岁。慢性胆囊炎胆石症急性发作,高血压病史10年,准备行胆囊切除术。术前血压185/100mmHg,心电图检查左心室肥大,心率68次/分。
此患者属高血压几期()
A.一期
B.二期
C.三期
D.四期
E.五期