采用标准加入法进行氟含量测定时,下列描述错误的是
A.加入的体积要小于试样体积的1%
B.加入的浓度要为待测浓度的100倍
C.电极斜率始终为0.059
D.电极的斜率由实测获得
A.加入的体积要小于试样体积的1%
B.加入的浓度要为待测浓度的100倍
C.电极斜率始终为0.059
D.电极的斜率由实测获得
第5题
A、It’s a cruel world, doll face. You might as well get used to it.
B、What kind of crazy chick are you? Do you know what’ll happen if he finds me?
C、Is your father by any chance a vulture?
D、You want to get every chicken in this place out of here at the SAME TIME?
第6题
A、ignore it so as to keep the fluency of communication
B、be more careful and adopt proper methods to correct student’s error
C、point out the error directly and correct it quickly
D、criticize the student because of the mistake
第9题
A、雷诺数Re越大,意味着流体的流动形态越有可能是湍流
B、雷诺数Re越大,意味着流体的运动轨迹越有可能是杂乱无章的
C、相同管道内输送同一流体时,雷诺数Re越大,意味着输送能力越大
D、输送能力相同、管道相同时,流体越黏,雷诺数Re越大
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