试题与答案

出铁开铁眼时,严禁乱捣乱烧,应保持炉眼内小外大的形状。

题型:判断题

题目:

出铁开铁眼时,严禁乱捣乱烧,应保持炉眼内小外大的形状。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C解析:人工种子是将愈伤组织形成的胚状体、不定芽、顶芽和腋芽经过人工包装形成的,故A正确。胚状体是要分化成根、茎和叶,故B正确。人工种子的种皮是人工包装的,故C错误。人工种子与自然种子相比,...

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