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【简答题】
为什么抗菌药物相对有选择地作用于病原微生物而不或较小影响机体 ?
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】—Can I help you? —I'd like for my twin sons. [ ]
A.
two pair of shoes
B.
two pairs of shoe
C.
two pair of shoe
D.
two pairs of shoes
【简答题】Al2O3在MgO中形成有限固溶体，在低共熔温度时，约有18wt%Al2O3溶入MgO中，假设形成的是置换型固溶体，且晶胞的体积无变化，则形成固溶体之后材料的密度如何变化？
【简答题】Al2O3在MgO中形成有限固溶体，在低共熔温度时，约有18wt%Al2O3溶入MgO中，假设形成的是间隙型固溶体，且晶胞的体积无变化，则形成固溶体之后材料的密度如何变化？
【单选题】单项选择。 — Can I help you? — I want ____, please. [ ]
A.
two socks
B.
two pair of socks
C.
two pairs of socks
D.
two pairs of sock
【单选题】John bought ________ for himself yesterday．
A.
two pairs of shoes
B.
two pair of shoe
C.
two pair of shoes
D.
two pairs shoes
【单选题】I bought two pairs of jeans, one for $19, .
A.
the other is $25
B.
the other for $25
C.
the other $25%
【单选题】- Can I help you? - I' d like ___________for my twin daughters. [ ]
A.
two pair of shoes
B.
two pairs of shoe
C.
two pair of shoe
D.
two pairs of shoes
【单选题】When I spent my holidays in Europe, I bought _______ vases.
A.
two lovely big old German
B.
two lovely old big German
C.
two German big old lovely
D.
lovely big two old German
【简答题】I bought the book two weeks ago. I ______ ______ the book for two weeks.
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