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【简答题】
根据下列短文回答问题。 Chinese food in London? They've got some rice, some vegetables and some chicken. They haven't got any noodles and they haven't got any beef. They've got some Chinese tea and some orange juice. It's healthy food and drink.? 1. What kind of food are they eating in London? _____________________________________ 2. Have they got any rice? _____________________________________ 3. They ha ven't got any beef, have they? _____________________________________ 4. Are they eating healthy food? _____________________________________ 5. Have they got any orange juice? _____________________________________ 6. Have they got any vegetables? _____________________________________
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【单选题】不带头结点的单链表 head 为空的判定条件是( )。
A.
head==NULL
B.
head.next==NULL (带头结点判定条件 )
C.
Head.next==head (循环链表判定条件 )
D.
head!=NULL
【简答题】永磁式直流电动机是通过____来实现改变电动机旋转方向的目的。
【简答题】永磁电动机旋转方向的改变是通过改变 ( )。
【简答题】电源( )是通过改变电动机电源的相序,使定子产生的旋转磁场方向与转子的旋转方向相反,从而产生制动力矩的一种制动方法。
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