The two objects must be in physical contact
The two objects must be the same size
There must be an existing temperature differential
There must be an existing weight differential
第1题：
For a current liability to exist, the following two tests must be met. The liability must be due usually within a year and must be paid out of current assets.()
第2题：
Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?
A.Leaking seal ring
B.Insufficient heat transfer from the exhaust valves
C.Blocked cooling water passages to the head
D.Excessive scavenging air provided to the engine
第3题：
Which of the following conditions will make a relation that is in first normal form. to be in second normal form?
Ⅰ.every non-key attribute is functionally dependent on the full set of primary key attributes.
Ⅱ.no non-key attributes exist in the relation.
Ⅲ.the primary key consists of only one attribute.
A．Ⅰ only
B．Ⅰ and Ⅱ only
C．Ⅰ and Ⅲ only
D．any of them
第4题：
Which of the following assists with airflow in a server？（）
第5题：
A system must be evaluated and tuned. In order to use a set of performance evaluation programs （e.g.， filemon， svmon， and tprof） which of the following packages should exist on the system in question？（）
第6题：
According to the passage, which of the following statement is not true?
A.the heat exchanging surfaces should be kept substantially clean
B.the heat exchanger flow passages should be clear of obstruction
C.seals for the plate heat exchanger needs to be renewed often
D.the cleaning process of the plate heat exchanger should be done following our experiences only
第7题：
A. LOCAL_ PREF
B. AGGREG ATOR
C. AS_Path
D. Weight
第8题：
Rule 14 describes the action to be taken by vessels meeting head-on. Which of the following conditions must exist in order for this rule to apply?______.
A.Both vessels must be power-driven.
B.They must be meeting on reciprocal or nearly reciprocal courses.
C.The situation must involve risk of collision.
D.All of the above
第9题：
Which attribute must exist in the BGP update packet?（）
第10题：
Which of the following components channels air flow through a server chassis？（）