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【单选题】
多根牙的牙膜附着面积最大的部位是( )A.
牙颈部
B.
根颈1/3
C.
根分叉处
D.
E.
根尖1/3
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反馈参考答案：
举一反三
【简答题】The wind () cold and raindrops fall
【简答题】临时反倾销措施实施的期限最长不得超过___________．
【单选题】______ is the most common cause of ice formation．
A.
The freezing of raindrops on contact with the vessel's structure
B.
Drastic fall in ambient temperature
C.
The deposit of water droplets on the vessel's structure
D.
Snowfall
【单选题】Geologists believe that ocean water came from
A.
comets.
B.
raindrops.
C.
volcanoes.
D.
other planets.
【简答题】A．Formation of raindrops in the air. B．Formation of vapor water in the air. C．Development of air pollution. D．Increase of raindrops.
【单选题】如图所示运算放大器电路,R1=5KΩ ,R2=100KΩ, 输入电压ui=0.1V, 则输出电压等于 ( ).
A.
2V
B.
-2V
C.
2.1V
D.
-2.1V
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