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【简答题】
Venice, a city in the northeast of Italy, is famous throughout the world for its buildings and romantic canals( 运河 ). But in February every year, people come to Venice for another reason. The City Carnival fills the place with excitement and fun. This year, the celebration runs from February 4 or 21. Colorful costumes have always played a very important role in the Venetian Carnival, The Carnival happens at the start of the Christian fasting( 斋戒 ) period of Lent. It was traditionally a time to go a bit crazy with eating, drinking, dancing and dressing up before the fast began. People used masks to hide their social identity so that the nobility( 贵族 ) would look no different from the commoners. Today the Carnival is largely for the tourists. “Venetians don't dress up for Carnival after the age of 10, ” Giuseppina Giudice, who has lived in the city all her life, told the Guardian. “ Al we see of Carnival is a river of strangers who flow into 1own to feel ‘Venetian'. They fill it, buy a cheap mask and leave with nothing but photographs of St. Mark s Square.” Some locals want to bring back the original( 最初的 ) feel of Carnival. In 2009 , two social networking groups started organizing their own carnival. Visitors were invited. But there were no expensive tickets or fancy ball dresses- -just an old-fashioned Italian street party. "Tourists are welcome to our party- the more we can show them about the real Venice rather than the postcard Venice, the better ,”Matteo Secchi, one of the organizers, told the Guardian.
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【简答题】简述真空发生器的工作原理。
【多选题】信号发生器根据其工作原理可以分为( )。
A.
磁电式信号发生器
B.
霍尔式信号发生器
C.
脉冲式信号发生器
D.
光电式信号发生器
【单选题】继电接触器控制电路中的中间继电器,在PLC控制中可以用()。
A.
T
B.
C
C.
S
D.
M
【简答题】真空发生器的工作原理是什么?
【单选题】真空搅拌机的结构是
A.
真空发生器,氩气装置,搅拌器,料罐自动升降器
B.
真空发生器,搅拌器,料罐自动升降器,程序控制模块
C.
真空发生器,旋转体,料罐自动升降器,电源控制器
D.
真空泵,搅拌器,料罐自动升降器,程序控制模块
E.
真空泵,旋转体,料罐自动升降器,程序控制模块
【单选题】 “What will you do during winter vacation?” “I don’t know, but it’s about time________ something.”
A.
I’m deciding
B.
I’ll decide
C.
I’d decided
D.
I decided
【判断题】真空提升脱气法是根据压力原理工作的。
A.
正确
B.
错误
【多选题】真空式吸盘按真空产生的原理包括:
A.
用真空泵产生真空的真空吸盘。
B.
用真空发生器产生真空的喷气式吸盘,物理原理是伯努利原理。
C.
靠机械作用实现真空的挤气负压式吸盘。
【单选题】真空搅拌器的真空发生器的工作原理是
A.
物理摩擦
B.
孔蚀
C.
真空泵
D.
环流负压
E.
射流负压
【单选题】真空发生器用于向转运模块真空吸盘提供负压气源。
A.
真空发生器
B.
传感器
C.
PLC
D.
气缸
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