皮皮学，免费搜题
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【单选题】
一个酶作用于多种底物时,其天然底物的Km值应该是A.
最大
B.
与其他底物相同
C.
最小
D.
居中间
E.
与Ks相同
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】下列各物质的分子间只存在色散力的是( )A. B. C. D. HBr E. F. G.
【单选题】在某一化学反应中，反应物B的浓度在5 s内从2.0 mol/L变成0.5 mol/L，在这5 s内B的化学反应速率为
A.
0.3
B.
0.3 mol/（L·s）
C.
0.4 mol（L·s） -1
D.
0.04 mol/L
【单选题】在某一化学反应中，反应物B的浓度在5 s内从2.5 mol/L变成0.5 mol/L，在这5 s内B的化学反应速率为（ ）
A.
0.4 mol/L
B.
0.4 mol/L·s
C.
0.4mol －1 ·L －1 ·s －1
D.
0.4 mol/（L·s）
【简答题】__________ is often more difficult to find trained men than to get financial support for scientific research. A． It B. That C. This D. What
【单选题】It is often more difficult to find trained men than ___for scientific research.
A.
getting financial support
B.
to get financial support
C.
get financial support
D.
in getting financial support
【单选题】______is often more difficult to find trained men than to get financial support for scientific research.
A.
It
B.
That
C.
This
D.
What
【单选题】My brother while he his bike and hurt himself.
A.
had fellen; was riding
B.
fell; were riding
C.
had fallen; rode
D.
fell; was riding
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