子宫切除术患者应在术前多长时间给予抗菌药物() ["0.5~1小时","2小时","12小时","24小时","48小时"]
构造柱施工每边伸入墙内长度应为()mm或伸至洞口边。 ["800","1000","1200","1400"]
具有β内酰胺环结构的药物是() ["普鲁卡因青霉素","丙酸睾酮","异烟肼","阿托品","苯佐卡因"]
纤维性强、弹性大以及质地疏松的中药制片时选用的黏合剂最好是() ["A.淀粉浆","B.水","C.糖浆","D.糊精浆","E.不同浓度的乙醇"]
当三相对称负载作星形连接时,线电流为相电流的()倍。 ["3","1","1/3"]
你能说说新中国燃气事业发展的历史吗?