下列 CHECK 约束条件中哪个总是有效的？&#91; &#93; A: CONSTRAINT gender_chk CHECK(gender IN (N'男',N'女')) B: CONSTRAINT birthday_chk CHECK(birthday > GETDATE()) C: CONSTRAINT mark_chk CHECK(mark<560) D: CONSTRAINT address_chk CHECK(address LIKE N'广州市%')

<mark></mark>标签表示（）

1M1T架控切除切除的开关为（）。 A: CHK B: CHRE C: FC D: LB

Marks on transport packages are classified according to their purpose A: Transport mark B: Indicative mark C: Warning mark D: Packing mark

Safety mark and protective mark refer to A: Transport mark B: Shipping packing mark C: Indicator sign D: warning sign

下面if语句统计“成绩（mark）优秀（90分以上）的男生以及不及格（60以下）的男生”的人数，正确的语句为（ ）。 A: if(gender=="男")and((mark<60)and(mark>=90)):n+=1 B: if(gender=="男")and((mark<60)or(mark>=90)):n+=1 C: if(gender=="男")or(mark<60)or(mark>=90)):n+=1 D: if(gender=="男")or(mark<60)and(mark>=90):n+=1

The simple figures, words and Numbers written, embossed and brushed on the shipping package are called A: indicative mark B: transportation mark C: warning mark D: sales mark

下列程序片段用于产生成绩等第，已定义score%和mark$分别表示成绩和等第。即60分（含）以上及格、75分（含）以上良好、90分（含）以上优秀，能获得预期结果的是______。 A: If score>=90 Then Mark="优秀" ElseIf score>=75 Then Mark="良好" ElseIf score>=60 Then Mark="及格" End If B: If score>=60 Then Mark="及格" ElseIf score>=75 Then Mark="良好" ElseIf score>=90 Then Mark="优秀" C: If score>=90 Then Mark="优秀"If score>=75 Then Mark="良好"If score>=60 Then Mark="及格" D: If score>=60 Then Mark="及格" ElseIf score>=75 Then Mark="良好"ElseIf score>=90 Then Mark="优秀" End If

ALT速率法测定时应用的指示酶（） A: AMD B: BLD C: CHK D: DG6PD E: EPOD

9. Mark drives quickly. Mark drives carefully.