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【单选题】
Modem 连接方式下,下列哪些原因决定了网络传输速度,( ) a.线路 b.电话交换机 c.Modem的速度 d.ISP所使用的Modem速度A.
a,c
B.
b,d
C.
a,b,c
D.
a,b,c,d
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举一反三
【简答题】挫折-攻击理论是（）提出的。
【单选题】The passage suggests that bank managers failed to consider whether or not the service improvement mentioned ______.
A.
was too complicated to be easily described to prospective customers.
B.
made a measurable change in the experiences of customers in the bank's offices.
C.
could be sustained if the number of customers increased significantly.
D.
was an innovation that competing banks could have imitated.
【单选题】One reason for quick population increase in underdeveloped countries is that ______.
A.
improved public health standards have reduced death rate greatly
B.
people can get government support if they have more kids
C.
those countries encourage people to have large families
D.
those countries have enough resources to support a large population
【单选题】Which of the following is among the benefits of learning an instrument for children?
A.
Improving behaviors and relieving stress.
B.
Promoting growth and improving intelligence.
C.
Boosting confidence and improving intelligence.
D.
Improving intelligence and strengthening memories.
【单选题】34gFeS0 4 ·7H 2 0样品受热脱水过程的热重曲线(样品质量随温度变化的曲线)如下图所示
A.
温度为78℃时固体物质M的化学式为FeSO 4 ?5H 2 O
B.
温度为l59℃时固体物质N的化学式为FeSO 4 ?3H 2 O
C.
在隔绝空气条件下，N得到P的化学方程式为FeSO 4 FeO+SO 3 ↑
D.
取适量380℃时所得的样品P，隔绝空气加热至650℃，得到一种固体物质Q，同时有两种无色气体生成，Q的化学式为Fe 2 O 3
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