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【多选题】
杆活塞式液压缸的特点是( )。A.
活塞两个方向的作用力相等
B.
活塞有效作用面积为活塞杆面积2倍时，工作台往复运动速度相等
C.
其运动范围是工作行程的2倍
D.
常用于实现机床的快速退回及工作进给
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举一反三
【简答题】青海( )藏族自治州是文化的主要发祥地,被誉为“中国文化之乡”。
【简答题】Directions: This exercise practises skimming and scanning-- that means reading very fast to find only the main ideas of a text. You will have only five minutes to read the text and identify the main i...
【单选题】Section B Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you ...
A.
Old people.
B.
Teenagers.
C.
Infants.
D.
Adults.
【单选题】Section B Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you ...
A.
Ancient.
B.
Complexity.
C.
Individualistic.
D.
Homogeneous population.
【单选题】Section B Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you ...
A.
A man should walk on the left of a woman.
B.
People eat with both hands in some countries but eat with one hand in other countries.
C.
Americans and British have a large number of different customs.
D.
People should leave one hand on their lap while eating.
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