皮皮学，免费搜题
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搜题
【单选题】
青霉素、头孢菌素导致细菌死亡的机制是:A.
破坏磷壁酸
B.
损伤细胞膜
C.
抑制菌体蛋白合成
D.
裂解肽聚糖的聚糖骨架
E.
抑制肽聚糖四肽侧链与五肽桥 的连接
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】激素间的相互作用有 、 、 、 。
【单选题】they visited the Science Museum, they showed great interest in everything they saw.
A.
The first time
B.
For the first time
C.
At first
D.
Until
【单选题】___ they visited our school, they showed great interest in everything they saw.
A.
The first time
B.
For the first time
C.
At first
D.
At the first time
【单选题】They showed great interest in everything they saw they visited the farm．
A.
for the first time
B.
at the first time
C.
at first
D.
the first time
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