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【单选题】
下面关于Watson-Crick DNA双螺旋结构模型的叙述中哪一项是正确的?
A.
3' , 5' -磷酸二酯键
B.
互补碱基对之间的氢键
C.
碱基堆积力
D.
磷酸基团上的负电荷与介质中的阳离子之间形成的离子键
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参考答案:
举一反三
【单选题】-_________ -I can't sleep well because my brother plays his CDs too loud. [ ]
A.
What's wrong?
B.
How do you sleep?
C.
You should sleep well.
D.
How are you feeling?
查看完整题目与答案
【单选题】根据()的走时差距可以计算震中距离。
A.
P波和压力波
B.
压力波和面波
C.
P波和S波
D.
S波和面波
查看完整题目与答案
【单选题】Could you ____, please? It's too loud. [ ]
A.
turn down the radio
B.
turn on the radio
C.
turn on the TV
D.
turn it on
查看完整题目与答案
【单选题】______ the radio, Tom. It's too loud. [ ]
A.
Turn on
B.
Turn down
C.
Turn off
D.
Turn up
查看完整题目与答案
【判断题】气相色谱法适于分析高沸点、热不稳定的样品。
A.
正确
B.
错误
查看完整题目与答案
【单选题】根据哪两个波的走时差距可以计算过震中距离?
A.
P波和S波
B.
P波和压力波
C.
压力波和面波
D.
S波和面波
查看完整题目与答案
【多选题】根据()和()的走时差距可以计算震中距离。
A.
压力波
B.
P波
C.
S波
D.
面波
查看完整题目与答案
【单选题】It ’ s too expensive. Can y ou ___ it cheaper?
A.
let
B.
make
C.
do
D.
done
查看完整题目与答案
【单选题】Can you ______________ the radio? It's too loud.
A.
turn up
B.
turn down
C.
turn on
查看完整题目与答案
【单选题】— ______ the radio? — I'm sorry. I know it's a little too loud. [ ]
A.
Would you turn on
B.
Could you please turn up
C.
Would you mind turning down
查看完整题目与答案
相关题目:
【单选题】-_________ -I can't sleep well because my brother plays his CDs too loud. [ ]
A.
What's wrong?
B.
How do you sleep?
C.
You should sleep well.
D.
How are you feeling?
查看完整题目与答案
【单选题】根据()的走时差距可以计算震中距离。
A.
P波和压力波
B.
压力波和面波
C.
P波和S波
D.
S波和面波
查看完整题目与答案
【单选题】Could you ____, please? It's too loud. [ ]
A.
turn down the radio
B.
turn on the radio
C.
turn on the TV
D.
turn it on
查看完整题目与答案
【单选题】______ the radio, Tom. It's too loud. [ ]
A.
Turn on
B.
Turn down
C.
Turn off
D.
Turn up
查看完整题目与答案
【判断题】气相色谱法适于分析高沸点、热不稳定的样品。
A.
正确
B.
错误
查看完整题目与答案
【单选题】根据哪两个波的走时差距可以计算过震中距离?
A.
P波和S波
B.
P波和压力波
C.
压力波和面波
D.
S波和面波
查看完整题目与答案
【多选题】根据()和()的走时差距可以计算震中距离。
A.
压力波
B.
P波
C.
S波
D.
面波
查看完整题目与答案
【单选题】It ’ s too expensive. Can y ou ___ it cheaper?
A.
let
B.
make
C.
do
D.
done
查看完整题目与答案
【单选题】Can you ______________ the radio? It's too loud.
A.
turn up
B.
turn down
C.
turn on
查看完整题目与答案
【单选题】— ______ the radio? — I'm sorry. I know it's a little too loud. [ ]
A.
Would you turn on
B.
Could you please turn up
C.
Would you mind turning down
查看完整题目与答案
参考解析:
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