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【单选题】
用于蒸汽发生器的( ),否则长期使用后蒸汽发生器加热管结垢,影响产生蒸汽的能力。A.
软化水
B.
自来水
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皮皮学刷刷变学霸
举一反三
【判断题】1) A college degree is important. 2) Having a college degree has many positive effects on a person's life. Sentence 2) is a better topic sentence.
A.
正确
B.
错误
【简答题】{ 阐述各种环境因素对动物细胞培养的影响。 } {
【判断题】1) A college degree is important.2) Having a college degree has many positive effects on a person's life.Sentence 2) is a better topic sentence.
A.
正确
B.
错误
【判断题】1) A college degree is important. 2) Having a college degree has many positive effects on a person's life. of the above two sentences, sentence 2) is a better topic sentence.
A.
正确
B.
错误
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