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【单选题】
旋光法测定5%葡萄糖注射液含量,取注射液适量,用10 cm的旋光管,依法测定。测得α=+2.45°,测定管长为200 mm,该注射液含量为相当于标示量的百分之几?A.
9.47%
B.
9.99%
C.
104.2%
D.
94.9%
E.
94.7%
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】A．Because it's interesting. B．Because it's enjoyable. C．Because it's economical. D．Because it's practical.
【单选题】顺序执行下列命令后，屏幕最后显示的结果是______。SELECT1USEABCSELECT2USEEFD?SELECT()
A.
0
B.
1
C.
2
D.
错误提示
【简答题】A．Because it's shining. B．Because it's rare. C．Because it's expensive. D．Because it came from ancient times.
【判断题】Because heuristics simplify the decision-making process, they are unlikely to lead to errors.
A.
正确
B.
错误
【简答题】A．Because it's safer. B．Because it's cheaper. C．Because it's faster. D．Because it's earlier.
【单选题】分析语句: create table t1 as select * from regions where 1=2; 结果是什么?
A.
会因为不可能的条件而失败
B.
不会创建表，因为条件为False
C.
会创建表t1，但不会插入行，因为条件为False
D.
会创建表t1，并插入regions表中的所有行
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