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单选题
Which of the pair can be distinguished by only one feature?
A
/s,/z/
B
/p/,/d/
C
/g/,/h/
D
/ l/,j/
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单选题which one of the following accurately describes field names?（）A
they must be unique in a database B
they can only be used once in a view C
they can only used once on each form D
they can be used mulriple times on a form
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单选题Which of the following sets of English sounds differs only in one distinctive feature? _____A
[v][e][i:][ð]B
[f][z][æ][i]C
[i:][i][e][æ]D
[p][i][e][s]
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单选题Which statement best describes Cisco IOS Zone-Based Policy Firewall？（）A
A router interface can belong to multiple zones.B
Policy maps are used to classify traffic into different traffic classes， and class maps are used to assignaction to the traffic classes.C
The pass action works in only one directionD
A zone-pair is bidirectional because it specifies traffic flowing among the interfaces within the zone-pair in both directions.
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单选题Which of the following sets of consonants differs only in one distinctive feature? _____A
[v][z][3][θ]B
[t][z][ʃ][ð]C
[s][v][ɜ][p]D
[p][d][z][S]
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多选题Which three statements about subqueries are true?（）AA single row subquery can retrieve only one column and one row.BA single row subquery can retrieve only one row but many columns.CA multiple row subquery can retrieve multiple rows and multiple columns.DA multiple row subquery can be compared by using the operator.EA single row subquery can use the IN operator.FA multiple row subquery can use the = operator.
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多选题Which four are attributes of single row functions? （）Acannot be nestedBmanipulate data itemsCact on each row returnedDreturn one result per rowEaccept only one argument and return only one valueFaccept arguments which can be a column or an expression
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