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【判断题】
( )在色谱图中,两保留值之比为为相对保留值。A.
正确
B.
错误
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【简答题】He was crying harder than Mildred had ever seen before. She __________ knew he was crying the greatest tears of all: tears of pride.
【单选题】Which of the following is people‘ s normal response to the movies they watch? 查看材料
A.
They feel that everything on the screen is familiar to them．
B.
They try to turn their dreams into reality．
C.
They become so involved that they forget their own problems．
D.
They are touched by the life stories of the actors and actresses．
【简答题】某单位调查了520名中年以上的脑力劳动者,其中136人有高血压史,另外384人则没有,在有高血压史的136人中,经诊断为冠心病及可疑者的有48人,在无高血压史的384人中,经诊断为冠心病及可疑者的有36人,对此资料中的高血压与冠心病有无关系作检验.
【单选题】With regard to normal losses, which of the following statement is true? 11
A.
Normal losses always occur in a particular process
B.
Normal loss i s the number of rejected outputs from a process.
C.
Normal loss units are valued at their scrap value in the process account.
D.
In the process account, the the corresponding figure for normal loss is always zero.
【单选题】关于几个数的乘除运算，下列说法中，错误的是（）。
A.
几个数字相乘或相除时，所得的积或商的有效数字的保留位数，应以各数值中有效数字最少的位数为标准
B.
在做乘除运算时，有效数字的位数取决于相对误差最大的那个数
C.
在做乘除运算时，有效数字的位数取决于相对误差最小的那个数
D.
几个数字相乘或相除时，以有效数字位数最少的数为标准，弃去过多的位数，然后进行乘除
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