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【简答题】
有一起重机的提升结构，其工作负载如图所示，图中：T 1 =760.3N·m，T 2 =345.3N·m，T 3 =622.9N·m，T 4 =204N·m；t 1 =0.38s，t 2 =16.3s，t 3 =30s，t 4 =0.17s，t 5 =16.5s，t 6 =56.6s。试选择一台8极三相绕线式异步电动机。
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举一反三
【单选题】After The Adventures of Tom Sawyer,Twain gives a literary independence to Tom's buddy Huck in a book entitled ______.
A.
Life on the Mississippi
B.
The Gilded Age
C.
The Adventures of Huckleberry Finn
D.
A Connecticut Yankee in King Arthur's Court
【单选题】In the afternoon, Mrs. Sawyer often drink tea with whom?
A.
Mr. Sawyer
B.
her daughter
C.
her friends
D.
her parents
【简答题】The Adventures of Tom Sawyer
【单选题】Where is Mrs. Sawyer going this morning?
A.
Her daughter's school
B.
Her son's school
C.
the shops
D.
Mr. Sawyer's company（公司）
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