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小题1:Why does the writer introduce so many animals from different places to us? A.To frighten us in the zoo. B.To make us lovely in the zoo. C.To attract us to the zoo. D.To show that animals can do everything. 小题2:How much does Mr. Smith have to pay if he visits the zoo with his two-year-old son? A.¥3. B.¥4. C.¥5. D.¥6. 小题3:At which of the following time can we visit the zoo? A.8:30 a.m. Wednesday. B.9:30 a.m. Friday. C.3:00 p.m. Sunday. D.5:00 p.m. Tuesday.
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【单选题】下列四种溶液中,由水电离出的c(H + )之比(依次)为   (   ) ①pH=0的盐酸 ②0.1mol/L的盐酸③0.01mol/L的NaOH溶液④pH=11的NaOH溶液
A.
0 :1 :12 :11
B.
1 :10 :100 :1000
C.
14 :13 :12 :11
D.
14 :13 :2 :3
【简答题】Write down the right word according to the meaning.
【单选题】设P:地球上有水,Q: 是无理数。命题“若地球上没有水,则 是无理数。”的真值为【 】。
A.
0
B.
1
【单选题】已知某电路的真值表如下图所示,该电路的逻辑表达式为
A.
ABC
B.
C+AB
C.
C
D.
AC+AB
【单选题】已知某电路的真值表如下表所示,该电路的逻辑表达式是( )。【图片】
A.
F=AB+C
B.
F=A+B+C
C.
F=C
D.
F=AB
【单选题】已知某电路的真值表如下表所示,则该电路的逻辑表达式为 。【图片】
A.
Y=C
B.
Y=ABC
C.
Y=AB+C
D.
【简答题】write down the right words
【单选题】已知某电路的真值表如下图所示,该电路的逻辑表达式为
A.
ABC
B.
C+AB
C.
C
D.
AB+AC
【简答题】write down the right words
【单选题】下列四种溶液,由水电离产生的c(H + )之比①:②:③:④是(  ) ①pH=0的盐酸; ②0.1mol/L盐酸; ③0.01mol/L的NaOH溶液; ④pH=11的NaOH溶液.
A.
1:10:100:1000
B.
0:1:12:11
C.
14:13:13:11
D.
14:13:12:13
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