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【多选题】
关于溶菌酶的溶菌作用,下列那些叙述是正确的( )A.
主要对革兰阳性细菌有裂解作用
B.
只作用于革兰阳性细菌的细胞壁，使之裂解
C.
作用于革兰阳性细菌细胞壁四肽侧链与五肽交联桥之间的联结
D.
作用于细菌细胞壁多糖骨架的β-1,4糖苷键
E.
外膜受损情况下可裂解革兰阴性细菌
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【简答题】简述普查和抽样调查的特点。
【单选题】Compared to other ceramic materials, ceramic-matrix composites have better or higher:
A.
oxidation resistance
B.
stability at elevated temperatures
C.
fracture toughnesses
D.
all of the above
【多选题】For a ceramic compound, what are the characteristics of the component ions that determine the crystal structure?
A.
the magnitude of the electrical charge on each ion
B.
the numer of atoms in ceramic
C.
the relative sizes of the cations and anions
D.
the weight of atoms in ceramic
【多选题】For a ceramic compound, what are the characteristics of the component ions that determine the crystal structure?
A.
the magnitude of the electrical charge on each ion
B.
the number of atoms in ceramic
C.
the relative sizes of the cations and anions
D.
the weight of atoms in ceramic
【单选题】The underlined words 'make-it-yourself' in 'Ceramic Works' means ______.
A.
showing first-class ceramics
B.
making ceramic works oneself
C.
making the largest vase
D.
seeing first-class ceramic works
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