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【单选题】
1千焦耳等于________千卡。A.
10 2
B.
0.2389
C.
23.89
D.
2.778×10 -4
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举一反三
【简答题】传感器是能感受被测量并按照 转换成可用输出信号的器件或装置。
【单选题】Tom was absent from school this morning, because sometimes he was a little weak and could ______ill .
A.
take
B.
set
C.
catch
D.
fall
【单选题】用ODS柱分析一有机弱酸混合物样品，以某一比例甲醇水为流动相时，样品容量因子较小，若想使容量因子适当增加，如何改变流动相的组成( )
A.
增加流动相中甲醇的比例
B.
增加流动相中水的比例
C.
流动相中加入少量HAc
D.
流动相中加入少量的氨水
【简答题】用ODS柱,分析一有机弱酸混合物样品。以某一比例甲醇水为流动相时,样品保留因子较小,若想使保留因子适当减小,如何改变流动相的组成() A增加流动相中甲醇的比; B增加流动相水中的比例; C流动相中加入少量HAc; D流动相中加入少量的氨水;
【单选题】Among the winners _________ father is seriously ill in hospital.
A.
stand little Tom who
B.
stood little Tom whom
C.
little Tom stands whose
D.
stands little Tom whose
【单选题】---Little Tom could hardly pass the exam, _ _______ _? ---_ ______ . Although he was ill the day before the exam.
A.
couldn’t Tom; Yes, he could
B.
could he; Yes, he could
C.
could he; No, he couldn’t
D.
couldn’t he; No, he couldn’t
【多选题】用ODS柱分析一有机弱酸混合物样品。以某一比例乙腈-水为流动相时，样品容量因子较小，若想使容量因子适当增加，如何改变流动相的组成( )
A.
增加流动相中乙腈的比例
B.
增加流动相中水的比例
C.
增大流动相pH
D.
降低流动相pH
【单选题】Mother was worried because little Tom was ill, especially _____ his father HHhhwas away in Canada. [ ]
A.
as
B.
that
C.
during
D.
if
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