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简述数据、数据库、数据库系统和数据库管理系统的概念。
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【简答题】数控机床最适合加工哪几种类型的零件？
【单选题】- -- Jack fell off the ladder yesterday, but he is all right now. ---What a lucky dog! He _________ himself badly.
A.
should injure
B.
could have injured
C.
should have injured
D.
might injure
【单选题】What a lucky boy__!He was won a four-week trip to France.
A.
David is
B.
is David
C.
David does
D.
does David
【单选题】John got a free flight to Paris for a holiday. ______ lucky boy he is! A) What C) What a C) What an
A.
B.
C.
C
【简答题】计算下列行列式的值(用行列式的定义):
【单选题】下列行列式的值未必是0的是
A.
行列式的主对角线上的数值都为零
B.
行列式有两行对应成比例
C.
上三角形行列式的主对角线上至少有一个数值都为0
D.
n阶行列式的非零元的个数少于n
【单选题】What a lucky boy ______! He has won a four-week trip to France.
A.
Daniel is
B.
is Daniel
C.
Daniel does
D.
does Daniel
【简答题】数控机床最适合加工工具有一下特点的零件:
【简答题】数控机床最适合加工具有哪些特点的零件?
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