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塑性和韧性较高，可以通过热处理强化，广泛应用于机械制造的是（ ）。
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【简答题】反接制动的方法是改变运行过程中通入电动机定子绕组中三相电源的( ),产生一与转子慣性转动方向相反的( )进行制动减速。当电动机的转速接近零(低于100r/min)时,速度继电器发出信号,立即( )反相序电源,否则会使电动机反向启动,引发事故。 图为单向旋转的电动机反接制动控制电路,主电路中用接触器KM1和KM2的主触点构成不同相序的接线,为限制反接制动电流,制动电路串接了( )。电动机正转过...
【单选题】The last sentence “Do the same with songs.” means you should encourage your child to learn and remember _________. prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
songs in the same way as he does with poems
B.
poems in the same way as he does with songs
C.
the poems and songs which are similar in meaning
D.
those songs that have the same meaning as poems
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