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【单选题】
下面关于网桥的说法中,不正确的是( )A.
网桥工作在数据链路层，对网络进行分段，并将两个物理网络连接成一个逻辑网络
B.
网桥可以通过对不要传递数据进行过滤，并有效地阻止广播数据
C.
网桥可以连接数据链路层协议不同的局域网
D.
网桥要处理其接收的数据，增加了传输时延
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【单选题】Prior to starting an AC generator prime mover, the voltage regulator cutout switch should be placed in the _____.
A.
manual position
B.
bus neutral position
C.
raise voltage position
D.
transfer position
【单选题】Prior to starting, the purpose of turning over a main propulsion diesel engine with the cylinder test cocks open, is to ______
A.
test the starting system
B.
remove condensation from the cylinders
C.
check the compression
D.
check for proper lube oil pressure
【单选题】Which of the listed pre-start procedures should be carried out prior to starting a crosshead type diesel engine after an overhaul?
A.
Pre-lube cylinders with hand cranks
B.
Open all air space drain cocks
C.
Open all indicator valves
D.
All of the above
【简答题】简述排序和索引的目的。
【单选题】Prior to starting most medium-speed propulsion diesel engines, which of the procedures listed should be observed?
A.
The expansion tank should be topped off
B.
The thermostatic water regulating valves should be manually opened
C.
The fuel filters should be changed
D.
The engine should be turned over slowly with the indicator cocks open
【单选题】Who should be notified prior to starting up a crane ________.
A.
The pumpman
B.
The stevedore foreman
C.
The engine room
D.
All the above
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