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王老师:19139051760(拨打)
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第1题

.People who ____ allergies can sometimes be given injections to help desensitize them. A.suffers B.having C.suffer fr
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第2题

It is difficult for the fat boy ____ the bike. A.to take up B.to ride C.riding D.to go through
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第3题

细化晶粒虽能提高金属的强度,但增大了金属的脆性。()
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第4题

置换固溶体必是无限固溶体。()
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