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【单选题】
直径为5mm的III级钢筋采用双面帮条焊时,帮条长度≥( )mm。A.
25
B.
30
C.
35
D.
40
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举一反三
【单选题】the primary reason for the malleability of metal is ( ).
A.
the nondirectional nature of metallic bonding
B.
the slide ability of planes of atoms in a metal under stress
C.
the bonds between atons breaking of covalently bonded crystals
D.
a gas of nearly free electrons formed by the outer electrons of the metal atoms
【单选题】The primary reason for the malleability of metal is?
A.
the nondirectional nature of metallic bonding
B.
the slide ability of planes of atoms in a metal under stress
C.
the bonds between atoms breaking of covalently bonded crystals
D.
a gas of nearly free electrons formed by the outer electrons of the metal atoms
【单选题】有关温度对酶活性的影响,正确的是?
A.
低温可以使酶失活
B.
催化的反应速度随温度升高而升高
C.
最适温度是酶的特征性常数
D.
最适温度随反应的时间而有所改变
E.
以上全不对
【单选题】有关温度对酶活性影响的不正确论述是
A.
最适温度不是酶的特性常数
B.
酶是蛋白质，即使反应的时间很短也不能提高反应温度
C.
酶制剂应在低温下保存
D.
酶的最适温度与反应时间有关
E.
从生物组织中提取酶时应在低温下进行
【简答题】Ability of the metal to flow is .
【判断题】Because the total concentration of a polluting element in an environmental sample provides no information concerning the fate of the element in terms of its interaction with sediment, its ability to c...
A.
正确
B.
错误
【单选题】The ability of a metal to resist being broken by forces _______ in opposite directions is shear strength.
A.
act
B.
acts
C.
acted
D.
acting
【单选题】Toughness is ______ ability of a metal to resist, or absorb, sudden shocks of loads without breaking.
A.
a
B.
an
C.
the
D.
which
【单选题】有关温度对酶活性影响不正确的是
A.
最适温度不是酶的特征性常数
B.
酶是蛋白质，即使反应的时间很短也不能提高反应温度
C.
酶制剂在低温下保存
D.
酶的最适温度与反应时间有关
【判断题】Because the total concentration of a polluting element in an environmental sample provides no information concerning the fate of the element in terms of its interaction with sediment, its ability to c...
A.
正确
B.
错误
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