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【单选题】
三相异步电动机起动瞬间,转差率为A.
S=0
B.
S=1
C.
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反馈参考答案：
举一反三
【简答题】I’ve never been able to _______ (draw) well.
【单选题】What ensures that the lungs expand as the chest wall expands?
A.
secreted surfactant
B.
negative pressure between the pleura
C.
serous liquid secreted by the pleura
D.
the elastic recoil of the alveolar tissue
【简答题】I’ve
never been able to _______ well.A. draw B. drawing
【单选题】What isolation level ensures serializable execution of transactions?
A.
Dirty read possible
B.
Nonrepeatable read possible
C.
Phantom possible
D.
Repeatable read
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