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【单选题】
()有更高的极压抗磨性和更好的高温低温性能A.
钙基润滑脂
B.
润滑脂
C.
通用润滑脂
D.
极压复合润滑脂
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【简答题】将500mg糖原样品用放射性氰化钾(K14CN)处理,被结合的14CN-正好是0.193μmol,另外500mg同一糖原样品,用含有3%的HCl的无水甲醇处理,使之形成还原末端的甲基葡萄糖苷。然后用高碘酸钾处理这个还原端成为甲基葡萄糖苷的糖原,新产生的甲酸准确值347μmol。计算(1)糖原的平均相对分子质量,(2)分支程度。
【单选题】It is implied in the text that the parents' change can be attributed to
A.
the complaint against the compulsory education.
B.
the occasional employment of school facilities.
C.
the intensified attempts of other sections with respect to personalization
D.
the more flexible timing and choice of subjects.
【单选题】已知score表如下图所示,若要“查询成绩在80~90之间的同学学号、课程号和相应成绩”,SQL语句不正确的是( )
A.
SELECT studentNo, courseNo, score FROM Score WHERE score>=80 AND score<=90< p="">
B.
SELECT studentNo, courseNo, score FROM Score WHERE score BETWEEN 80 AND 90
C.
SELECT studentNo, courseNo, score FROM Score WHERE (score NOT BETWEEN 0 AND 80) AND (score NOT BETWEEN 90 AND 100)
D.
SELECT studentNo, courseNo, score FROM Score WHERE score IN (SELECT score FROM Score WHERE score>=80 AND score<=90)< p="">
【简答题】A．Leave the errors in the paper. B．Let the woman use the typewriter. C．Read the paper again. D．Rewrite the paper.
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