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【单选题】
下列说法中正确的是（ ）A.
化学键的断裂和形成是化学反应中能量变化的主要原因
B.
化学反应速率为0.8mol/（L?s）是指1s内生成0.8mol该物质
C.
化学键只能使原子相结合，不能使离子相结合
D.
天然气﹑石油和水煤气分别属于化石能源﹑可再生能源和二次能源
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举一反三
【单选题】What kind of services does Athens Daily Menu provide?
A.
catering services
B.
car services
【单选题】下面 4 个选项中,均不是合法浮点数的选项是
A.
160.,0.12,e3
B.
123,2e4.2,e5
C.
-.18,123e4,0.0
D.
-e3,.234,1e3
【单选题】What does the writer of this passage disapprove of regarding services now?
A.
Their fast growth.
B.
Their decline.
C.
Their prices.
D.
Their quality.
【单选题】亲水胶体溶液中加入一定量的乙醇可出现沉淀,这是因为
A.
溶媒浓度改变析出沉淀
B.
盐桥作用析出沉淀
C.
质量电荷改变析出沉淀
D.
胶体水化膜被破坏析出沉淀
E.
电荷中和凝结成沉淀
【单选题】What does the course 'Managing Public Services' involve?
A.
Organizational Behavior.
B.
Different modules of interests.
C.
Theories of public services.
D.
Management of business.
【单选题】According to the advertisement, what does Peace Piano Services encourage its customers to do?
A.
Apply for a store credit card
B.
Buy a piano through its web site
C.
Try out pianos in its stores
D.
Compare prices with those in competing stores
【单选题】What does the professor imply about funerals and memorial services?
A.
They are becoming a major expense for bereaved families.
B.
They include three days of fasting and silent prayer.
C.
They are part of a growing industry associated with death.
D.
They help make the person's life and death meaningful.
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