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【单选题】
铸铁中 ω ( Si )每增加 1% ,共晶点碳的质量分数相应 。A.
降低1/3
B.
降低0.4倍
C.
增加1/3
D.
增加0.4倍
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举一反三
【单选题】So loudly ______that the audience in the back heard him clearly.
A.
does he speak
B.
he speaks
C.
did he speak
D.
he spoke
【单选题】So loudly______ that the audience in the back heard him clearly.
A.
does he speak
B.
did he speak
C.
he speaks
D.
he spoke
【简答题】The teacher always talks in a _____ voice in class. He usually speaks______ to the class. (loudly, loud)
【简答题】( ) The clothes you wear will tell people what group of people you are. 2. ( ) The author realized he also judged people by their clothes although he complained about this before. 3. ( ) The...
【单选题】下列关于癌基因的说法正确的是
A.
癌基因只存在于病毒中
B.
带有癌基因一定患癌
C.
癌基因指一段具有将正常细胞转换为肿瘤的核酸片段
D.
在正常细胞中，原癌基因是由癌基因变化而来
E.
以上说法都不对
【单选题】下列关于原癌基因和癌基因的叙述不正确的是
A.
原癌基因是人或动物细胞中固有的正常基因
B.
当原癌基因的结构发生异常或表达失控时，就会使原癌基因激活成为有恶性转化能力的癌基因
C.
癌基因在正常细胞中也存在
D.
必须消除癌基因才可以消除肿瘤
E.
基因点突变是导致原癌基因活化的主要方式之一
【简答题】根据句意及所给首字母，完成下列句子。 1. He often speaks loudly. We can't s _ . 2. —Let's go to a movie this Sunday! —That's a good i ______ 3. There isn't much money in my w _ 4. Li Yong is a famous h ...
【多选题】下列关于癌基因、原癌基因、抑癌基因叙述中,正确的是
A.
原癌基因是细胞生长、分化必需的基因
B.
病毒癌基因是病毒基因组中正常基因，是病毒增殖必需的
C.
抑癌基因是基因组中的一类奢侈基因
D.
细胞癌变说明细胞DNA一定发生了变化
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