题目
A.Looking
B.Looked
C.Seeing
D.Seen
第1题
A.SELECT * FROM erexam NATURAL LEFT OUTER JOIN exampaper;
B.SELECT * FROM erexam NATURAL LEFT JOIN exampaper;
C.SELECT * FROM erexam NATURAL JOIN exampaper;
D.SELECT * FROM erexam OUTER JOIN exampaper;
E.SELECT * FROM erexam NATURAL OUTER JOIN exampaper;
F.SELECT * FROM erexam LEFT OUTER JOIN exampaper;
第2题
Cosmic ( 宇宙的) rays of various kinds come __________ the air from outer space
[A] across
[B] to
[C] from
[D] through
第3题
A.SELECT * FROM erexam NATURAL LEFT OUTER JOIN exampaper;
B.SELECT * FROM erexam NATURAL LEFT JOIN exampaper;
C.SELECT * FROM erexam NATURAL JOIN exampaper;
D.SELECT * FROM erexam OUTER JOIN exampaper;
E.SELECT * FROM erexam NATURAL OUTER JOIN exampaper;
F.SELECT * FROM erexam LEFT OUTER JOIN exampaper;
第4题
A.SELECT * FROM erexam NATURAL LEFT OUTER JOIN exampaper;
B.SELECT * FROM erexam NATURAL LEFT JOIN exampaper;
C.SELECT * FROM erexam NATURAL JOIN exampaper;
D.SELECT * FROM erexam OUTER JOIN exampaper;
E.SELECT * FROM erexam NATURAL OUTER JOIN exampaper;
F.SELECT * FROM erexam LEFT OUTER JOIN exampaper;
第5题
A.SELECT * FROM erexam NATURAL LEFT OUTER JOIN exampaper;
B.SELECT * FROM erexam NATURAL LEFT JOIN exampaper;
C.SELECT * FROM erexam NATURAL JOIN exampaper;
D.SELECT * FROM erexam OUTER JOIN exampaper;
E.SELECT * FROM erexam NATURAL OUTER JOIN exampaper;
F.SELECT * FROM erexam LEFT OUTER JOIN exampaper;
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