牵引变电所日常巡视由值守人员负责,每天巡视应不少于()次,巡视时不得进行其它工作,并要认真填写记录。
A、四
B、三
C、二
参考答案:A
He____ in London for many years, but he has never regretted his final decision to move back to China.
A.lived
B.was living
C.have lived
D.had lived
下列哪一种是女性月经周期中的正反馈现象
A.雌激素增高促进FSH和LH的释放
B.LH对GnRH分泌的促进
C.FSH对GnRH分泌的促进
D.GnRH对FSH分泌的促进
E.GnRH对LH分泌的促进