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【简答题】
当气流连续通过流化床的床层时，床层内那些带出速度小于操作气速的颗粒将不断被带出去，这种现象称为（）。
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举一反三
【单选题】Often enough the craft worker's place of employment in ancient Greece was set in rural isolation. Potter, for instance, found it convenient to locate their workshops near their source of clay, regardl...
A.
production techniques
B.
similarity to other crafts
C.
unusual materials
D.
resemblance to earlier pottery
【单选题】makes the peasant worker proud is he has set up a new bridge for the villagers.A．What; thatB．Wha
A.
35． makes the peasant worker proud is he has set up a new bridge for the villagers. A．What; that
B.
What; because
C.
That; what
D.
That; because
【单选题】A time-study specialist has set the production rate for each worker on a certain job at 22 units every 3 hours. At this rate what is the minimum number of workers that should be put on the job if at l...
A.
5
B.
8
C.
12
D.
13
E.
30
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