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有的真菌必须在两种不同寄主植物上生活才能完成生活史,这称为
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进行茎尖培养脱毒时,通常以带1-3个幼叶原基的茎尖作为外植体较合适,则茎尖的长度约为
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十进制数2018转化为二进制数为( )
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— What a careful boy you are! — Thank you. In fact, Tom does everying even _____ than me.
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I won’t buy that coat because I don’t like its color _____ its style.
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It is bad for your eyes to read in _____ sun.
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_____ boys are running along the bank.
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I have no difficulty in making _____ understood in English.
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We climbed higher up the mountain so that we could get a better _____ .
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Boiled water _____ considered to be one of the best healthy drinks.
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Your bedroom is too small. There is _____ room for us to come in.
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Few of them hurt themselves in the accident last night, _____ ?
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What he said _____ me and we quarreled later.
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He often got his car _____ at the garage.
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The students in our school are made _____ school uniforms on Monday.
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— When will the plane _____ Wuhan? — Sorry. I'm a stranger. I don't know.
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某放大器中三极管三个极的电位分别是2V,1.3V,5V,可判断该管为( )。
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当输入电压为正弦信号时,如果用9013型三极管组成共发射极放大电路发生饱和失真,则输出电压的波形将。( )
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在多级放大电路的下述三种耦合方式中,前后级静态工作点必然会互相影响的是
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差分放大电路的作用是( )信号
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