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制动试验台按试验台测量原理不同，可分为（)和（)两类。、

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变换及测量装置是将传感器送来的电信号变换成易于测量的（)或（)信号的装置。

Many Chinese students don't pay much attention to spoken English at school.They think it necessary to practice speaking English in class. Here is a story to show you how important it is to speak the English language 1_in everyday life.
A foreigner once got hungry and went into a restaurant in London. He sat down at a table.
When the waiter came, he opened his mouth, put his fingers__2it and took them out again in order to express that he wanted something to eat for he could not speak English.
The waiter soon brought a cup of tea. The man shook his head. The waiter then took away the tea and brought a cup of coffee. The man again shook his head. The man tried again and again, but he wasn't able to make_3_understood. Finally another man came in. He spoke English clearly and fluently. In a few minutes, there was a large plate of meat and vegetables on the table_4him.
So you see a man often goes hungry if he doesn't__5_a foreign language.
(1)
A：into
B：freely
C：before
D：himself
E：master
(2)
A：into
B：freely
C：before
D：himself
E：master
(3)
A：into
B：freely
C：before
D：himself
E：master
(4)
A：into
B：freely
C：before
D：himself
E：master
(5)
A：into
B：freely
C：before
D：himself
E：master

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C 国家实验室认可
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