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5,5,14,38,87,() A.167;B.168;C.169;D.170;
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5,5,14,38,87,() A.167;B.168;C.169;D.170;
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87,108,135,169,212,()。 A.260B.268C.302D.512
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87,108,135,169,212,()。A.260B.268 C.302D.512
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5,5,14,38,87,()A.167B.168C.169D.170
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5 5 14 38 87 ( )。A.167B.168C.169D.170
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如题4-212所述 该电机额定运行时的效率为()。(A)86.2% (B)87.8% (C)89.