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【单选题】
汽油机用功率混合比的混合气工作时,燃烧速度最快,功率也最大。功率混合比是指混合气的过量空气系数为( )A.
0.75 ~ 0.85
B.
0.85 ~ 0.95
C.
0.95 ~ 1.05
D.
1.05 ~ 1.15
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反馈参考答案：
举一反三
【单选题】100mL 6mol·L -1 H 2 SO 4 跟过量锌粉反应，一定温度下，为了减缓反应进行的速率，但又不影响生成氢气的总量，可向反应物中加入适量 [ ]
A.
碳酸钠(固体)
B.
水
C.
硫酸钾(固体)
D.
硫酸铵(固体)
【简答题】Part B Write a short composition according to the topic given below.I lobe My Hometown
【单选题】Part B Listening Comprehension Directions: In this part of the test there will be some short talks and conversations. After each one, you will be asked some questions. The talks, conversations and que...
A.
From 6 am to 6 pm.
B.
From 9 am to 9 pm.
C.
From 6 am to midnight.
D.
All day.
【简答题】In this part, you will hear ten short conversations between two speakers. At the end of each conversation, a question will be asked about what was said. The conversations and the questions will be spo...
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