海船船员考试
单选题The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）A one valve seats upwards, while the other seats downwardsB the reed valves used on the discharge are made substantiall
题目
one valve seats upwards, while the other seats downwards
the reed valves used on the discharge are made substantially thicker and heavier than the suction valves
the suction valve springs exert a greater tension than the discharge valve springs
the discharge valve springs exert a greater tension than the suction valve springs
相似问题和答案
第1题：
The pressure of a liquid leaving the pump can be referred to as the ______.
A.total head
B.discharge head
C.net positive suction head
D.suction head
第2题：
The fitting at the end of a cargo line in a tank that allows suction to be taken close to the bottom of a tank is a ______．
A.Suction end
B.Strainer
C.Bell-mouth
D.Vacuum valve
第3题：
The major difference between project and line management is that the project manager may not have any control over which basic management function?
A . Decision-making
B . Staffing
C . Rewarding
D . Tracking/monitoring
E . Reviewing
第4题：
degree to which policies were based on tradition
form of economic interdependency between different cultural groups
treatment of the native inhabitants
relationship between the military and the settlers
根据第二段可知，美国和墨西哥对德克萨斯的殖民化的主要不同在于，墨西哥人和土著印第安人通婚，并吸收他们的文化。而美国却征服当地人。因此，主要区别是对待当地居民的态度不同。
第5题：
A major difference between archiving and backing up data is that data backups：（）
- A、contain data removed from the server.
- B、contain data that still resides on the server.
- C、are stored with the servers.
- D、are stored securely.
正确答案:B
第6题：
Before discharge of cargo tank ballast is undertaken，______．
A.the deck isolating valve is open
B.flue gas isolating valve
C.blower suction valve
D.blower discharge valve
第7题：
What is the major difference between deductive learning of grammar and inductive learning of grammar?
A basic distinction in learning theory is between deductive learning and inductive learning. Deductive learning is an approach to language teaching in which learners are taught rules and given specific information about a language. They then apply these rules when they use the language. In contrast, in inductive learning learners are not taught grammatical or other types of rules directly but are left to discover or induce rules from their experience of using the language. The former is explicit teaching of grammar while the latter is implicit.
略
第8题：
To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the_______ .
A.suction service valve as a vapor
B.suction service valve as a liquid
C.discharge service valve as a vapor
D.charging valve as a liquid
第9题：
第10题：
centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pump
centerline of the pump and the suction liquid level when the source of liquid is above the pump
centerline of the pump and the level of the discharge liquid
liquid levels of the suction and discharge