海船船员考试
单选题The main advantage of improved Simplex tailshaft seal are（）A the good sealing performance and the simple structureB the good sealing performance and the short life expectancyC the good sealing performance but the short life expectancyD the good sealing
题目
the good sealing performance and the simple structure
the good sealing performance and the short life expectancy
the good sealing performance but the short life expectancy
the good sealing performance and the lower cost
相似问题和答案
第1题：
The bearing of tailshaft sealing equipment which adopts the oil nature circulation is hot, the reason is
A.the rotate speed fluctuation
B.the ventilation tube clogged
C.the main engine accelerate so fast
D.stormy waves
第2题：
A. Higher administrative complexity
B. Increased level of security
C. More effective usage of computing resources
D. Improved performance for users
第3题：
What is the main idea of the passage?
A. Multitasking has become a way of life.
B. Multitasking often leads to efficiency decline.
C. Multitasking exercises need to be improved.
D. Multitasking enables people to remember things better.
第4题：
封闭区（seal zone）
正确答案:环绕皱褶缘的破骨细胞膜与骨基质紧密接触，形成一个封闭区，使骨吸收陷窝与周围骨基质相对隔离，构成骨吸收的局部微环境。
第5题：
Which of the listed functions is the purpose of a gas scrubber in an inert gas generation system ________．
A.Cools the inert gas
B.Maintains the oxygen content at 5% by volume
C.Drains off static electricity in the inert gas
D.Maintains the water seal on the gas main
第6题：
A.Scaling
B.Copying
C.Duplex
D.Simplex
第7题：
A centrifugal pump may fail to deliver water when first started if the ______.
A.water seal pipe is plugged
B.pump is not primed
C.seal ring is properly located
D.impeller is flooded
第8题：
A.was taking advantage of
B.take advantage of
C.takes advantage of
D.taking advantage of
第9题：
单工通信（Simplex Communication）
正确答案:单工通信就是通信只在一个方向上发生。这种通信方式在日常生活中用得很多，如广播电台，BP机，电视传播等都是单工通信的例子。
第10题：
仿宋字编辑变成simplex字体的原因
正确答案: 问题：原CAD文件被天河打开后其中的仿宋字体一旦被点一下编辑就变成了simplex字体，而单开CAD编辑就没问题。
原因：这是由于该文件中文字样式 standard 和PCCAD模板中的同名文字样式的字体样式不同造成的。
可打开PCCAD安装目录下的模板文件 《PCCAD.DWT》修改其文字样式 standard 的字体样式为宋体，保存后再重新打开该文件编辑。