下列html的语法规则中,说法正确的有()。 A. HTML标记不区分大小写,和是相同的; B. html文件一行可以写多个标记,一个标记也可以分多行来写,不用任何符号; C. HTML文件以纯文本形式存放,扩展名为”*.htm”或”*.html”对任何系统都适用; D. html标记,可以嵌套,可以交叉,形成复杂的语句;
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【简答题】Passage Five Questions 22 to 26 are based on the following passage. Plastics are materials which are softened by heat and set into lasting form when shaped in a mold. Some are natural; some are semi-s...
【单选题】Examine the description of the MARKS table: SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects. Examine this SELECT statement based on the MARKS table: What is the result of the ...
A.
The statement executes successfully and returns the student ID and sum of all marks for each student who obtained more than the average mark in each subject.
B.
The statement returns an error at the SELECT clause.
C.
The statement returns an error at the WHERE clause.
D.
The statement returns an error at the ORDER BY clause.