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柯尔伯格将儿童道德发展阶段划分为()水平,()阶段。
The function of the bypass valve on the self-contained breathing apparatus is to().
A. control the pressure of the oxygen as it enters the body
B. allow the wearer to manually give himself oxygen
C. release excess heat which would otherwise cause the bottle to explode
D. allow exhaled gases to pass outside the bottle
6个月婴儿,急起喘憋l天。查体:体温38.1℃,呼吸80次/分,心率160次/分,烦躁不安,唇发绀,满肺哮鸣音,喘憋缓解时可闻少许中、细湿啰音,肝右肋下2cm。患儿进一步出现以下症状:呼吸困难加重,端坐呼吸、大汗淋漓、三凹征阳性、两肺哮鸣音。应考虑是()
A. 循环衰竭
B. 哮喘持续状态
C. 心力衰竭
D. 合并肺炎
E. 肺气肿
巴比妥酸分光光度法测定空气中的吡啶,配制巴比妥酸-丙酮水溶液的方法是:称取1.25g巴比妥酸,溶解于()丙酮水溶液100ml中,必要时可()促使溶解。
A. (1+1),加热
B. (1+2),加热
C. (1+1),搅拌