皮皮学，免费搜题
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【单选题】
军团菌肺炎宜选用A.
青霉素G
B.
氨苄青霉素
C.
羧苄青霉素
D.
红霉素
E.
第一代头孢菌素
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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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