【多选题】下列说法正确的是
A.
由于许多因素都会影响郎伯比尔定律的线性关系,所以实际测定时只是在某一浓度范围内符合郎伯比尔定律
B.
根据郎伯比尔定律,实际测定中回归方程所确定的直线一定过原点,否则就是错误的
C.
线性相关性系数 r 越接近于 1 ,说明点和线之间的吻合程度越高
D.
分析化学中,用标准曲线进行定量时,一般要求 r 达到 0.999 以上
E.
回归方程所确定的直线,一定通过因变量平均值和自变量平均值所确定的点
【判断题】( )硒是动物所必需的微量矿物质元素,又是有毒物质。
【单选题】空心阴极灯中对发射线半宽度影响最大的因素是( )
【单选题】At 31 December 20X5 the following require inclusion in a company’s financial statements:(1) On 1 January 20X5 the company made a loan of $12,000 to an employee, repayable on 1 January 20X6,charging in...
A.
Current assets $10,000 Current liabilities $12,240
B.
Current assets $22,240 Current liabilities $nil
C.
Current assets $10,240 Current liabilities $nil
D.
Current assets $16,240 Current liabilities $6,000
【单选题】中国传统医学所强调的“阴阳平衡”体现了中国文化中的( )精神。
【单选题】一般中高浓度点的准确度要求在( )范围内
【单选题】LH business rents out office space to MN at an annual rent of $48,000. MN makes payments one month in advance on the 1st of each month. All rental income has been received during the year ended 31 Jul...
A.
Dr Rental income $4,000; Cr Current liabilities $4,000
B.
Dr Rental income $4,000; Cr Prepayments $4,000
C.
Dr Prepayments $ 4,000; Cr Rental income $4,000
D.
Dr Current liabilities $4,000; Cr Rental income S4,000
【单选题】收款凭证是由出纳人员根据审核无误的原始凭证填制的。收款凭证的日期填写是( )