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【单选题】
空气燃油比是( )之比。 1 进入燃烧室的空气质量流量 2 进入燃烧室的燃油质量流量 3 进入燃烧室的燃油质量流量 完全燃烧所需的理论空气 量 4 1kg 燃油 燃烧后实际吸收的热量 5 1kg 燃油 燃烧理论上释放出的热量A.
①与②
B.
②与①
C.
①与③
D.
④与⑤
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皮皮学刷刷变学霸
举一反三
【单选题】—Why does Jane feel so upset? —She failed the exam and she has no friends ____.
A.
talking with
B.
to talk
C.
to talk with
【单选题】如在急性吸入毒性实验当中,随着苯的浓度越来越高,各试验组的小鼠死亡率也相应增高,这说明存在质反应关系
A.
量反应关系
B.
质反应关系
C.
剂量-量反应关系
D.
剂量-质反应关系
【单选题】Why does she feel that way?
A.
She has too much to do.
B.
She failed a test.
C.
She is getting married.
D.
Someone woke her up.
【单选题】Why does she feel that way?
A.
She has too much to do.
B.
She failed a test.
C.
She is getting married.
D.
Someone woke her up.
【单选题】How does the woman feel when she hears about the news?
A.
She is surprised.
B.
She is happy.
C.
She is sad.
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