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【单选题】
斑釉牙表面沉着的色素由A.
牙釉质表面吸附外来色素所致
B.
氟沉积于牙釉质所致
C.
氟沉积于牙本质所至
D.
氟与牙釉质内磷灰石结合变色
E.
氟与牙本质内磷灰石，结合变色
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举一反三
【单选题】设SC表中记录成绩的列为：Grade，类型为int。若在查询成绩时，希望将成绩按“优”、“良”、“中”、“及格”和“不及格”形式显示，正确的Case函数是______。
A.
Case GradeWhen 90～100 THEN"优"When 80～89 TIIEN"良"When 70～79 THEN"中"When 60～69 THEN"及格"。Else"不及格"End
B.
CaseWhen Grade between 90 and 100 THEN Grade="优"When Grade between 80 and 89 THEN Grade="良"When Grade between 70 and 79 THEN Grade="中"When Grade between 60 and 69 THEN Grade="及格"Else Grade="不及格"End
C.
CaseWhen Grade between 90 and 100 THEN"优"When Grade between 80 and 89 THEN"良"When Grade between 70 and 79 THEN"中"When Grade between 60 and 69 THEN"及格"Else"不及格"End
D.
Case GradeWhen 90～100 THEN Grade="优"When 80～89 THEN Grade="良"When 70～79 THEN Grade="由"When 60～69 THEN Grade="及格"Else Grade="不及格"End
【单选题】()是由国务院制定的规范性法律文件,是国家行政机关体系中高度的规范性文件,由国务院总理签署国务院令公布实施。
A.
法律
B.
行政法规
C.
部门规章和地方规章
D.
安全技术规范
【单选题】case函数的格式正确的是( )
A.
case(depth<=70 "Shallow" depth>70 AND depth<=300 "Mid" depth>300 "Deep")
B.
case(depth<=70, "Shallow" , depth>70 AND depth<=300, "Mid" , depth>300, "Deep")
C.
case(depth<=70, "Shallow" , depth>70 && depth<=300, "Mid" , depth>300, "Deep")
D.
case(depth<=70, "Shallow" , depth>70 && depth<=300, "Mid" , depth>300, "Deep")
【单选题】设SC表中记录成绩的列为：Grade，类型为int。若在查询成绩时，希望将成绩按‘优’、‘良’、‘中’、‘及格’和‘不及格’形式显示，正确的Case函数是（）。
A.
Case Grade When 90~100 THEN ’优’ When 80~89 THEN ’良’ When 70~79 THEN ’中’ When 60~69 THEN ’及格’ Else ’不及格’ End
B.
Case When Grade between 90 and 100 THEN Grade = ’优’ When Grade between 80 and 89 THEN Grade = ’良’ When Grade between 70 and 79 THEN Grade = ’中’ When Grade between 60 and 69 THEN Grade = ’及格’ Else Grade = ’不及格’ End
C.
Case When Grade between 90 and 100 THEN ’优’ When Grade between 80 and 89 THEN ’良’ When Grade between 70 and 79 THEN ’中’ When Grade between 60 and 69 THEN ’及格’ Else ’不及格’ End
D.
Case Grade When 90~100 THEN Grade = ’优’ When 80~89 THEN Grade = ’良’ When 70~79 THEN Grade = ’中’ When 60~69 THEN Grade = ’及格’ Else Grade = ’不及格’ End
【简答题】沥青防水卷材有哪些类型及其品种
【简答题】高聚物改性沥青防水涂料类型、品种有哪些?
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