ground the board
avoid reversing the polarity of the leads
isolate sensitive components with heat sinks
all of the above
第1题：
● Serialization delay and （71） delay are the two components of network delay that are improved by increasing bandwidth. Serialization delay, i.e. the amount of time it takes to put the （72） on the wire, and queuing delay (depth of the queue) are improved by increasing the （73） from a 128Kbps circuit to a T1. However, three other components of delay, routing/switching delay, distance delay, and protocol delay are components that can not be positively affected by an （74） in bandwidth. If the circuits are not over-utilized, then increasing the bandwidth to improve the （75） of the application will only result in an increased bandwidth with no positive effects on performance.
第2题：
A circuit breaker and a fuse have a basic similarity(类似) in that they both ______.
A.can be reset to energize the circuit
B.should open the circuit when overloaded
C.will burn out when an over current flow develops
D.should short the circuit when overloaded
第3题：
For (71) service, we need a virtual-circuit subnet. Let us see how that works. The idea behind virtual circuits is to avoid having to choose a new (72) for every packet sent. Instead, when a connection is established, a route from the (73)machine to the destination machine is chosen as part of the connection setup and stored in tables inside the (74) That route is used for all traffic flowing over the connection, exactly the same way that the telephone system works. When the connection is released, the virtual circuit is also terminated. With connection-oriented service, each packet carries an (75) telling which virtual circuit it belongs to.
A．connectionless
B．connection-oriented
C．datagram
D．telegram
第4题：
Which of the following is the term used to describe the aggregation of multiple components to formone logical component?（）
第5题：
When weighing anchor in a rough sea，how would you avoid risk of damaging the bow plating ________．
A.Heave it home as fast as you can
B.Heave it home intermittently，between swells
C.Leave the anchor under foot，until the vessel may be brought before the sea
D.Wait for a calm spot between seas，then house it
第6题：
A. Hard disk drive failure
B. NTLDR file is missing
C. BIOS is corrupted
D. System board failure
第7题：
A circuit breaker and a fuse have a basic similarity in that they both______.
A.can be reset to energize the circuit
B.should open the circuit when overloaded
C.will burn out when an over current flow develops
D.should short the circuit when overloaded
第8题：
Catalog sheets submitted with the bid must be “originals” and not copies; drawings, schematics and/or circuit diagrams and printed circuit board diagrams must be ().
A、legislative
B、legionary
C、legible
D、legal
第9题：
On an ONS 15454 node you can tunnel a（n） （）.
第10题：
电子公告牌BBS的正确英语写法是（）