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4) But once people are _______________to having something free, it can be very difficult to persuade them to pay for it.

答案: accustomed完整句子:But once people are accustomed to having some...
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平面磨機(jī)床運(yùn)動(dòng)時(shí)人員不能在機(jī)床兩旁走動(dòng),以防被撞到,造成安全事故的發(fā)生()

A.正確
B.錯(cuò)誤
答案: 在操作平面磨床或其他機(jī)械設(shè)備時(shí),安全是首要考慮的因素。機(jī)床在運(yùn)動(dòng)時(shí),操作人員應(yīng)保持一定的安全距離,避免身體任何部分進(jìn)入機(jī)...
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