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【单选题】
关于革兰阳性菌和阴性菌细胞壁结构的描述，哪项正确A.
革兰阴性菌肽聚糖含量丰富，壁厚，坚韧，有外膜
B.
革兰阴性菌肽聚糖含量少，壁薄，无外膜
C.
革兰阳性菌肽聚糖含量丰富，壁薄，无外膜
D.
革兰阳性菌肽聚糖含量少，壁厚，有外膜
E.
革兰阳性菌肽聚糖含量丰富，壁厚，无外膜
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【单选题】Exchange students must have the following qualifications EXCEPT
A.
over 11/12 years of education.
B.
speaking English well.
C.
a good record in school.
D.
being 15 to 18 years old.
【简答题】如何确定沉积岩的相对地质年代？
【简答题】如何确定沉积岩的相对地质年代?
【简答题】All students must have access to quality education without regard wealth or class. A.for B .of C.in D.to
【单选题】Students must be strict ____ their studies and teachers should be strict _____ their students.
A.
in, at
B.
at, with
C.
with , in
D.
in, with
【简答题】如何确定沉积岩的相对地质年代 ?
【单选题】The author probably feels that
A.
the educational system is sound, and students must follow every rule
B.
parents alone must take responsibility for the rise in student cheating
C.
the educational system in this country would benefit from a thorough evaluation
D.
students who cheat should be expelled from school
【简答题】如何确定沉积岩的相对地质年代
【单选题】Prospective students must show that they have sufficient money to cover their course fees and ______.
A.
support
B.
sustenance
C.
supply
D.
maintenance
【简答题】如何确定沉积岩的相对地质年代？
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