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【单选题】
三段生殖毒性试验的划分是依据( )。A.
胚胎发育时间
B.
胚胎发育速度
C.
观察时间
D.
给药时间
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Which logic gate is AND gate?
A.
When all inputs are high, the output is high.
B.
When all inputs are low, the output is low.
C.
When all inputs are high(logic 1), the output is high, otherwise the output is low(logic 0).
D.
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.
【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
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