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【单选题】
-般电话铃晌不超过( )声,应拿起电话。A.
二
B.
三
C.
四
D.
五
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【简答题】简单蒸馏的主要特点是________；简单蒸馏操作时易挥发组分的物料衡算式是________。
【简答题】一对渐开线标准直齿圆柱齿轮传动,已知两轮中心距等于a,传动比等于i12,则齿轮1的节圆半径等于(__)。
【简答题】After water, sand and gravel are the most used natural materials in the world. But a looming global shortage has led to a boom in clandestine sand mining and even outright theft. In the southern India...
【单选题】已知一齿轮泵中,两渐开线直齿圆柱外齿轮为正常齿,传动比为3,小齿轮齿数为20,模数为3mm,中心距为125mm,则该齿轮传动为。 A. 标准直齿轮传动 B. 正角度变位齿轮传动 C. 高度变位齿轮传动 D. 负角度变位齿轮传动
A.
B.
C.
D.
D
【单选题】已知b,d,fs,不计凸轮与挺杆处摩擦，不计挺杆质量,若要挺杆不被卡住，a必须满足的条件（ ）。a=b/(2fs) B、ab/(2fs) D、任何a都不会卡住【图片】
A.
B
B.
A
C.
C
D.
D
【多选题】A. competition B. owner C. apology
D.
existence
E.
threat 7 Who ’ s the ______ of the house ? 8. Terrorism is a ______ to the whole country. 9. We're in _______ with several other companies for the project . 10. We led a happy _______ as children. 11. I made my _______ to my host and left early. A. symbol B. symbolic C. symbolize 12. The pigeons _____ peace. 13. The lion is the _____ of courage. 14. They not only have _____ meanings. 15. A. harmony B. harmonious C. harmonize 和谐社会 a_______ society
【多选题】二、选词填空 (45%) A. competition B. owner C. apology
D.
existence
E.
threat 7 Who ’ s the ______ of the house ? 8. Terrorism is a ______ to the whole country. 9. We're in _______ with several other companies for the project . 10. We led a happy _______ as children. 11. I made my _______ to my host and left early. A. symbol B. symbolic C. symbolize 12. The pigeons _____ peace. 13. The lion is the _____ of courage. 14. They not only have _____ meanings. 15. A. harmony B. harmonious C. harmonize 和谐社会 a_______ society
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