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【单选题】
革兰阳性菌细胞壁的主要成分是A.
肽聚糖
B.
磷壁酸
C.
多糖
D.
脂蛋白
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反馈参考答案：
举一反三
【简答题】由( )植物体上切取下来的,用于( )的各种接种材料。包括( )、组织、细胞或原生质体等叫做( )
【单选题】______means the lack of a logical connection between the form. of something and its expression in sounds.
A.
Ambiguity
B.
Abstractness
C.
Arbitrariness
D.
Fuzziness
【单选题】Lack of meteorological and tidal research means, researchers have to depend on
A.
measuring the output of coconut.
B.
observing the erosion of foreshores.
C.
collecting short interesting accounts concerning climate.
D.
computer model on climate changes.
【单选题】It can be inferred from the last paragraph that scientists______.
A.
lack sufficient means to combat lead pollution
B.
still consider lead pollution a problem
C.
believe lead pollution is not a problem any more
D.
have found way to solve the problem of lead pollution
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