用试剂法测定白酒中的总酸,是以酚酞为指示剂,采用()溶液进行中和滴定。
A. 氢氧化钠
B. 盐酸
C. 碳酸钠
D. 氢氧化钾
《中国铁路总公司技术管理规程》空调失效超过()min不能恢复但列车能够正常运行时,列车长可视情况通知司机向列车调度员提出在前方最近客运站停车的请求,列车调度员安排列车在前方最近客运站停车。
A. 15
B. 20
C. 30
D. 50
一母马,草料迟细,体瘦毛焦,倦息肯卧,肚腹虚胀,尿短粪稀,口色淡黄,舌白,脉缓濡。该病中兽医证属于
A. 脾气下陷
B. 寒湿困脾
C. 脾阳虚
D. 胃阴虚
E. 脾虚不运
The second stage feed-water temperature and shell absolute pressure in a multistage, flash
A. higher than the first stage feed-water temperature and absolute shell pressure
B. lower than the first stage feed-water temperature and absolute shell pressure
C. the same as the first stage feed-water temperature and absolute shell pressure
D. not related to the feed-water temperature and absolute shell pressure