What can you learn from the story?
A.Jim and he lost in touch since graduation from high school.
B.Jim and he have known each other since high school days.
C.Jim and he won't keep in touch in the future.
第2题
比色法测总磷的过程中用作配置磷标准液的试剂是()
A.领苯二甲酸氢钾
B.磷酸氢二钾
C.磷酸钾
D.磷酸二氢钾
第8题
A. 白色,红色,黄色
B. B.黄色,淡黄色,白色
C. C.白色,淡黄色,黄色
D. D.红色,黄色,白色
第9题
钼蓝比色法测磷的测量波长为()。
A.600nm
B.620nm
C.640nm
D.660nm
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