第1题:
测量葡萄糖溶液旋光度时,零点校正是指: When measuring the optical rotation of glucose solution, zero correction refers to
A.旋光计测量室放入蒸馏水试管,找出弱照度的均匀视场(零度视场),记下此时刻度盘的左右读数平均值,即零点校正值 Put tube contained distilled water into the polarimeter measuring chamber, find out the uniform field of view (zero degree field of view) with weak illumination, and record the average reading values from the left and right dial at this time, that is, the zero correction value#B.旋光计测量室不放任何试管,找出弱照度的均匀暗视场,记下此时刻度盘的左右读数平均值,即零点校正值。 Without any test tube in the polarimeter measuring chambe第2题:
2、测量葡萄糖溶液旋光度时,零点校正是指: When measuring the optical rotation of glucose solution, zero correction refers to
A.旋光计测量室放入蒸馏水试管,找出弱照度的均匀视场(零度视场),记下此时刻度盘的左右读数平均值,即零点校正值 Put tube contained distilled water into the polarimeter measuring chamber, find out the uniform field of view (zero degree field of view) with weak illumination, and record the average reading values from the left and right dial at this time, that is, the zero correction value#B.旋光计测量室不放任何试管,找出弱照度的均匀暗视场,记下此时刻度盘的左右读数平均值,即零点校正值。 Without any test tube in the polarimeter measuring chambe第3题:
4、万用表刻度线分为均匀和非均匀两种,其中测量电流、电压量的刻度线为均匀刻度线。
第4题:
刻度值 A是仪器指示装置的最大刻度所代表的被测量的数值。
第5题:
1.在欧姆表测量电阻时,应选适当的倍率,使指针指示在中值附近。最好使刻度在1/2~2/3处的部分,这部分刻度比较精确。