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【单选题】
革兰阴性菌较革兰阳性菌更容易产生细菌的L型，是因为革兰阴性菌 （）A.
缺少外膜
B.
肽聚糖层数较少
C.
缺少磷壁酸
D.
菌体内渗透压较革兰阳性菌高
E.
缺乏五肽交联桥
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皮皮学刷刷变学霸
举一反三
【单选题】No matter where it is used, 'Flextime' system has proved ______.
A.
entirely effective
B.
a complete failure
C.
to be disliked by the employers
D.
too difficult to carry out
【简答题】Before relativistic particle physics, the constituents of matter had always been considered as being either elementary units which were indestructible and unchangeable, or as composite objects which c...
【简答题】No matter what the methods we use, the final result is that we will need to decrease CO2emissions by 70% to 0% simply to stabilize ______.
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