在矿化度测定过程中,洛黑T指示剂必须要控制pH为()。因为洛黑T在此条件下显色最敏感。
A.5
B.7
C.10
D.12
参考答案:C
阅读下面短文,在标有序号的空白处填入一个适当的词,或填入括号中单词的正确形式,并将答案写在答题纸上。(共10小题;每小题1分,满分10分)
One night, Mrs. Riley was walking along a dark street. She was carrying her handbag in one 小题1: and a plastic carrier bag in the other. There was 小题2: else in the street except two youths. They were standing in a dark shop doorway. One of them was very tall with fair hair; the other was short and fat with a beard and moustache.
The youths waited 小题3: a few moments, and then ran quickly and quietly towards Mrs. Riley. The tall youth held her from 小题4: while the other youth tried to snatch her handbag.
Suddenly, Mrs. Riley 小题5: (throw) the tall youth over her shoulder. He crashed into the other youth and they 小题6: landed on the ground. Without 小题7: (speak), Mrs. Riley hit both of them on the head with her handbag, and walked calmly 小题8:.
The two 小题9: (surprise) youths were still sitting on the ground when Mrs. Riley crossed the 小题10: towards a door with a lighted sign above it. Mrs. Riley paused, turned round, smiled at the youths and walked into the South West London Judo Club.
下面单位中是国际单位制中的基本单位的是( )
A.kg Pa m
B.N s m
C.摩尔开尔文安培
D.牛顿 秒 千克