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【简答题】
直接写得数。 0.9×99+0.9= 0.25×40= 9.9÷ = 400÷25÷8= 4÷8= - = -0.75-25%= 10- = 1÷ × = 8.75-(3.6+0.75)=
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举一反三
【简答题】三相交流异步电动机的反接制动是通过改变定子绕组中的电流相序,使其产生一个与 来实现的。
【简答题】These Beginner Books are specially written to help encourage your child to learn to read — and develop a ________________ love of reading.
【判断题】国家标准对孔和轴分别规定了26种基本偏差,反映了26种公差带的位置,构成了基本偏差系列。( )
A.
正确
B.
错误
【单选题】Encourage your child to reach a(n) between what he wants and what you want.
A.
harmony
B.
agreement
C.
balance
D.
compromise
【简答题】七选五 Reading for Fun—Top Tips to Encourage Your Child You know reading is fun.However,it’s a visual world,and kids may think of reading as boring or uninteresting.But showing a child how wonderful read...
【简答题】Childhood Obesity Obesity means having too much body fat. Childhood obesity is a serious medical condition. It causes (1) and even lead to poor self-esteem and (2) . How to pr child-...
【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
【判断题】反接制动是改变电动机三相电流的相序,使电动机的旋转磁场反转的方法。( )
A.
正确
B.
错误
【单选题】Encourage your child to reach a ___________ between what he wants and what you want.
A.
agreement
B.
compromise
C.
quarral
D.
disapproval
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