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【简答题】
举例说明化学因素对 对胎儿的影响 ?
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反馈参考答案：
举一反三
【单选题】下列拓扑结构中，全属于广播式网络的拓扑结构的是（）。 ①星型 ②网状型 ③环型 ④总线型 ⑤卫星通信型 ⑥树型
A.
①②④⑥
B.
①③⑤⑥
C.
③④⑤⑥
D.
②④⑤⑥
【单选题】Name the logic gate that is formed by this circuit.
A.
positive logic OR gate
B.
positive logic AND gate
C.
negative logic OR gate
D.
negative logic AND gate
【单选题】Name the logic gate that is formed by this circuit. ______【图片】
A.
positive logic OR gate
B.
positive logic AND gate
C.
negative logic OR gate
D.
negative logic AND gate
【单选题】Which logic gate is Not gate?
A.
The output of a NOT gate is the opposite of the input.
B.
When all inputs are high(logic 1), the output is high, otherwise the output is low(logic 0).
C.
As long as one of the inputs is high (logic 1), the output is high(logic 1); Only when all inputs are low, the output is low.
D.
If the input is high,the output is also high.
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