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【多选题】
有以下SQL语句 create type Dollars as numeric(12,2) final; create type Pounds as numeric(12,2) final; --创建表:US_university (美国大学,包括两列:名称、预算) create table US_university (name varchar(25) not null, budget Dollars not null); -- --创建表:UK_university (英国大学,包括两列:名称、预算) create table UK_university (name varchar(25) not null, budget Pounds not null); 以下选项正确的是:A.
Dollars和Pounds属于独特类型
B.
select us.name, uk.name from us_university as us, uk_university as uk where us.budget = uk.budget;
C.
select us.budget + 200000 from us_university as us;
D.
us_unviersity.budget 与 uk.university.budget不能相加
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举一反三
【单选题】12单选When impurity atoms are found in the voids or interstices among the host atoms, it is called a/an solid solution.
A.
Substitutional
B.
Vacancy
C.
Interstitial
D.
None of the above
【单选题】When impurity atoms replace the host atoms, it is called a/an_______solid solution.
A.
Substitutional
B.
Vacancy
C.
Interstitial
【单选题】When impurity atoms replace the host atoms, it is called a/an solid solution
A.
Substitutional
B.
Vacancy
C.
Interstitial
D.
NO
【多选题】The forming conditions for a substitutional solid solution are that the host atoms and the impurity atoms have________.
A.
Similar atomic sizes
B.
Similar Electron configurations
C.
Similar crystal lattice structure
D.
Same polarity
【单选题】Interstitial solid solution belongs to .
A.
infinite solid solution
B.
finite solid solution
C.
unhomogeneous solid solution
D.
substitutional solid solution
【单选题】When impurity atoms are found in the voids or interstices among the host atoms, it is called a/an solid solution.
A.
Substitutional
B.
Vacancy
C.
Interstitial
D.
NO
【单选题】单选When impurity atoms replace the host atoms, it is called a/an solid solutionA.Substitutional
A.
Substitutional
B.
Vacancy
C.
Interstitial
D.
None of the avove
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