High pressure compressors are more efficient than low pressure compressors
Mechanical efficiency divided by compressor efficiency will equal the overall efficiency of the compressor unit
Two stage compressors are generally more efficient than single stage compressors
The volumetric efficiency is decreased in multistage compressors
第1题：
A language change is inevitable
B language change is abrupt
C language change is universal
D language change is extensive
第2题：
第3题：
Which of the following statements about Leopold and Rudolph Blaschka is TRUE?
A. They were brothers.
B. They were artists.
C. They were florists.
D. They were farmers.
32．答案为B。根据第一段最后一句，the work of two artists-naturalists，Leopold Blaschka and his son Rudolph作出该项选择。
第4题：
Which statements concerning the relationships between the following classes are true？（） class Foo { int num； Baz comp = new Baz（）； } class Bar { boolean flag； } class Baz extends Foo { Bar thing = new Bar（）； double limit； }
第5题：
Which of the following statements concerning intellectual property is wrong？（）
第6题：
Which of the following conditions is true concerning a flammable liquid with a concentration above the upper explosive limit?
A.The mixture is too lean to burn
B.The mixture is too rich to burn
C.The vapor is about to explode
D.Conditions are perfect for combustion
第7题：
第8题：
Which of the following statements is true? Accounts payable are ______.
A．debts owed to suppliers
B．related to purchases of goods on an open account
C．current liabilities
D．all of the above
第9题：
The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command（）。
第10题：
Energy can be created or destroyed
Energy may not be transformed
The total quantity of energy in the universe is always the same
None of the above