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【简答题】
什么是液体的粘性?常用的粘度表示方法有哪几种?说明粘度的单位。
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反馈参考答案：
举一反三
【单选题】All the students were studying in class Tom;he was playing football on the playground.A．exceptB．be
A.
All the students were studying in class____ Tom;he was playing football on the playground. A．except
B.
besides
C.
except for
D.
except on
【简答题】He and Tom were our guests in Paris over the holidays.
【单选题】We ______ for Tom at ten last Sunday. He often kept us ______.
A.
were waiting; waiting
B.
were waiting; wait
C.
waited; waiting
D.
waited; wait
【单选题】is surprising to us is that Tom can speak English fluently as though he were a native speaker.
A.
What
B.
That
C.
Which
D.
As
【简答题】切断一根链杆相当于解除_______约束，而切断一根梁式杆相当于解除_______个约束
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