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【判断题】
PLC的扫描周期与PLC的类型和程序的长短有关。A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】近代中国社会的主要矛盾是:
A.
资本主义与帝国主义之间的矛盾
B.
帝国主义与中华民族之间的矛盾、封建主义与人民大众之间的矛盾
C.
地主与农民之间的矛盾
D.
资产阶级与无产阶级的矛盾
【简答题】Tom didn’t take part in the after -school activity yesterday. ( 改为反意疑问句 Tom didn’t take part in the after -school activity yesterday, _________ _________?
【单选题】Suppose relation R(A,C) has the following tuples: A C 3 4 6 4 2 3 3 5 7 1 and relation S(B,C,D) has the following tuples: B C D 5 1 6 1 5 8 4 4 9 Compute the natural join of R and S. Which of the foll...
A.
(6, 4, 3, 9)
B.
(3, 4, 3, 9)
C.
(7, 5, 1, 6)
D.
(3, 4, 3, 9)
【单选题】Suppose relation R(A,B) has the following tuples: A B 1 2 1 5 5 6 and relation S(B,C,D) has the following tuples: B C D 2 4 6 6 6 8 5 7 9 Compute the natural join of R and S. Which of the following tu...
A.
(1,2,6,8)
B.
(3,4,7,8)
C.
(1,6,6,8)
D.
(1,5,7,9)
【单选题】福楼拜专门用名词( )来形容虚荣肤浅且不切实际,耽于物欲的行为,批判爱玛这种想入非非的品性。
A.
“零度风格”
B.
“包法利主义”
C.
“非个人化”
D.
“客观而无动于衷”
【单选题】Tom didn’t go hiking with his classmates his illness.
A.
because
B.
because of
C.
since
【单选题】Tom didn’t go hiking with his classmates ____ his illness.
A.
because
B.
because of
C.
as
D.
since
【单选题】Suppose relation R(A,B,C) has the following tuples: A B C 1 2 3 4 7 8 4 5 6 2 5 3 1 2 6 and relation S(A,B,C) has the following tuples: A B C 2 5 3 6 1 4 4 5 6 1 2 3 Compute (R - S) union (S - R), oft...
A.
(4,7,8)
B.
(4,5,3)
C.
(1,5,6)
D.
(1,2,3)
【单选题】Suppose relation R(A,C) has the following tuples: A C 3 4 6 4 2 3 3 5 7 1 and relation S(B,C,D) has the following tuples: B C D 5 1 6 1 5 8 4 4 9 Compute the natural join of R and S. Which of the foll...
A.
(6, 4, 4, 9)
B.
(3,4,4,9)
C.
(7,5,1,6)
D.
(3,4,3,9)
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