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一水平放置的双杆液压缸，采用三位四通电磁换向阀，要求阀处于中位时，液压泵卸荷，液压缸浮动，其中位机能用H型；要求阀处于中位时，液压泵卸荷，且液压缸不动，其中位机能用（ ）。A.
O 型
B.
M 型
C.
Y 型
D.
H 型
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【简答题】句型转换。 1. Her mother often made her clean her bedroom. (同义句) She often her bedroom by her mother. 2. We used to keep the classroom clean. (一般疑问句) you to keep the classroom clean? 3. I suppose Class Thr...
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【简答题】合力对平面上任一点之矩等于各分力对同一点的矩的( )
【简答题】阅读理解。 Lisa goes shopping with her mother. Her mother wants to buy some food. Lisa wants to buy a new skirt. They come to a shop. Lisa and her mother go in. There are many people in the shop. Lisa find...
【简答题】I watch her and her mother decorate her college dormitory room. Everything is in place organized and arranged. Her room nicely accommodates not only her clothes and bric-a-brac(小摆设), but her ___36___ ...
【简答题】Don’t
know where she got her brains. Her mother, I suppose.
【简答题】A girl got sick of living with her strict parents and ran away from home. However, she found out that life was not easy on her own. She couldn’t find a job, so she decided to make money by begging. Ye...
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