I earn dollars()hour as()supermarket cashier on Saturdays.
第1题:
______(salary)people who earn more than a few thousand dollars must pay a certain percentage of their salaries.
第2题:
A.What an
B.How a
C.What a
D.What
第3题:
– I made 500 dollars in an hour. --______________.
A、OK.
B、It doesn’t matter.
C、Are you kidding?
D、I don’t know.
第4题:
A、a,an
B、an,a
C、the,a
D、the,an
第5题:
方法①∠B小于90°;
左上为A,左下为B,右下为C,右上为D;
已知∠B=∠D;AB=CD;
证明:过A作AN⊥BC于N;
过C作CM⊥AD于M;
连接AC
∵AN⊥BC;CM⊥AD
∴∠ANB=∠DMC=90°
又∵∠B=∠D;AB=CD
∴△ANB=△DMC(AAS)
∴AN=CM;BN=DM
又∵∠ANB=∠DMC=90°,AC=AC
∴△ACD=△AMD(HL)
∴AM=DN
又∵BN=DM
∴BD=AC
∵BD=AC;AB=CD
∴凸四边形ABCD为平行四边型。
方法②∠B大于90°
左上为A,左下为B,右下为C,右上为D;
已知∠B=∠D;AB=CD;
证明:延长CD,过A作AN⊥BC于N;
延长AB,过C作CM⊥AD于M;
连接AC
∵AN⊥BC;CM⊥AD
∴∠ANB=∠DMC=90°
又∵∠B=∠D;AB=CD
∴△ANB=△DMC(AAS)
∴AN=CM;BN=DM
又∵∠ANB=∠DMC=90°,AC=AC
∴△ACD=△AMD(HL)
∴AM=DN
又∵BN=DM
∴BD=AC
∵BD=AC;AB=CD
∴凸四边形ABCD为平行四边型。
方法③∠B等于90°
证明:∵∠B=∠D=90°;AB=CD;AC=AC
∴△ABC=△ADC(HL)
∴AB=CB
∵BD=AC;AB=CD
∴凸四边形ABCD为平行四边型。
有错吗?若我的证明有错请明示,我知道有个反例,但它是凹四边形。
第6题:
18.
A.An
B.A
C.The
D.Some
第7题:

第8题:


第9题:
第10题:
Excuse me, how can I get to the nearest supermarket? ()
第11题:
Which of the following commands gathers network packet statistics?()
第12题:
ⅠB
ⅡA
ⅢA
ⅢB
ⅣB
第13题:
A.a, an
B.an, /
C.a, /
D.an, a
第14题:
Student: How long can I have these books?
Librarian: This one is on the three-hour-loan; you may have it for only three hours ______.
A: The others are due in 30 days, on February 3.
B: You may have it longer if you like.
C: Drop the books into the RETURN boxes by the library entrance.
D: The fine for overdue books is 5 dollars an hour.
第15题:
– When are you leaving? -- _________.
A、How much?
B、In an hour.
C、One hundred dollars.
D、I’m fine.
第16题:
A、the,an
B、a,an
C、an,a
D、an,the
第17题:
A.netstat-i
B.ifconfig-a
C.errpt-a
D.iptrace-i
第18题:
10. I have ________apple. It’s ______ red apple.
A.a;an
B.an;a
C.the;the
D.a,the
第19题:
第20题:

第21题:
I earn dollars()hour as()supermarket cashier on Saturdays.
Aa;an
Bthe;a
Can;a
Dan;the
第22题:
GFM-1600的I10为()。
第23题:
a;an
the;a
an;a
an;the