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【单选题】
下列关于酶的叙述，错误的是A.
酶促反应具有特异性
B.
酶能对其特异底物起高效催化作用
C.
所有的酶都是蛋白质
D.
酶是机体内催化各种代谢反应最主要的催化剂
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反馈参考答案：
举一反三
【单选题】单斜晶系中，晶体常数特点为：
A.
a=b≠c, α=γ=90°, β>90°
B.
a≠b≠c, α=β=90°, γ>90°
C.
a=b≠c, α=β=90°, γ>90°
D.
a≠b≠c, α=γ=90°, β>90°
【多选题】预防砌筑砂浆和易性差、沉底结硬的措施是( )。
A.
水泥砂浆尽量用高强水泥配置
B.
不用细砂
C.
严格控制塑化材料的质量和掺量
D.
随伴随用
E.
灰桶中砂浆经常翻拌和清底
【单选题】墙体按构造形式可分为( )。 I.实体墙;II.空体墙;III.块材墙;IV.复合墙;V.板材墙;VI.现浇墙;
A.
Ⅰ、Ⅳ、Ⅴ
B.
Ⅱ、Ⅲ、Ⅳ
C.
Ⅰ、Ⅱ、Ⅳ
D.
Ⅰ、Ⅳ、Ⅴ、Ⅵ
【单选题】You can never imagine ____ when she received our nice birthday present. [ ]
A.
how she was pleased
B.
how excited she was
C.
how happy was she
D.
she was how happy
【单选题】单斜晶系中，晶体常数特点为
A.
a=b ¹ c, a = g =90 ° , b >90 °
B.
a=b ¹ c, a = b =90 ° , g >90 °
C.
a ¹ b ¹ c, a = b =90 ° , g >90 °
D.
a ¹ b ¹ c, a = g =90 ° , b >90 °
【单选题】When the doctors told Sang Lan that she would never again be a gymnast, she _______ overcome her disappointment and be proud of the things she had accomplished. [ ]
A.
would
B.
could
C.
was able to
D.
should
【多选题】预防砌筑砂浆和易性差、沉底结硬的措施是（）
A.
水泥砂浆尽量用高强水泥配制
B.
不用细砂
C.
严格控制塑化材料的质量和掺量
D.
随拌随用
E.
灰桶中的砂浆经常翻拌和清底
【单选题】What does a woman usually do when she is going to buy something?
A.
She never arranges a plan for what she is going to buy.
B.
She doesn't ask the shop assistant to help her.
C.
She seldom asks about its price.
D.
She will not try it on in the shop.
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