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【单选题】
钟状期牙胚中央,内釉上皮局部的增厚为A.
无釉柱釉质
B.
釉结
C.
釉索
D.
釉板
E.
釉丛
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举一反三
【单选题】Even students of average intelligence ________ become top students by improving their study habits.
A.
must
B.
can
C.
have to
D.
ought to
【单选题】The second paragraph means that _______.
A.
only students from China study at the top universities
B.
no other students but Japanese and Chinese students study at the top universities
C.
Chinese students often fight against Japanese students
D.
famous universities in the United States attract more Chinese students
【单选题】At the class meeting, some top students introduced several ________ to the study of English. [ ]
A.
approaches
B.
means
C.
metho ds
D.
ways
【单选题】下列关于影响土体渗透系数的因素描述中正确的是( ) 1粒径大小和级配;2结构与孔隙比;3饱和度;4矿物成分;5渗透水的性质。
A.
只有①③⑤对渗透系数有影响
B.
只有①②④对渗透系数有影响
C.
只有②③④⑤对渗透系数有影响
D.
①②③④⑤对渗透系数都有影响
【单选题】At the class meeting, some top students introduced several ____ to the study of English. [ ]
A.
approaches
B.
ways
C.
means
D.
methods
【简答题】渗透率和渗透系数是描述含水层_____的参数,影响渗透系数大小的主要因素是_____和_____,随着地下水温度的升高,渗透系数_____。
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