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【单选题】
关系模式的候选关键字可以有 ()A.
0个
B.
1个
C.
多个
D.
1个或多个
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反馈参考答案：
举一反三
【单选题】铁路货车斜探头空载始波宽度的测试时，先将直探头置于CSK－IA标准试块上厚度（）处，调节探伤仪，定出标记。
A.
81mm
B.
91mm
C.
101mm
D.
121mm
【单选题】客车斜探头空载始波宽度的测试时，先将直探头置于CSK－IA标准试块上厚度（）处，调节探伤仪，定出标记。
A.
81mm
B.
91mm
C.
101mm
D.
121mm
【单选题】My aunt ____ my sister to marry Henry, but my sister married Frank at last.
A.
advised
B.
persuaded
C.
suggested
D.
warned
【单选题】My aunt ____ my sister to marry Henry, but my sister married Frank at last.
A.
advised
B.
persuaded
C.
suggested
D.
banned
【单选题】You want to know why I am leaving? I am leaving _____ I am fed up with the job and boss.
A.
because
B.
since
C.
as
D.
for
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