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【单选题】
小明是A型血,他若输血应首先选择 [     ]
A.
O型血
B.
A型血
C.
B型血
D.
AB型血
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【单选题】有一平面轮廓的数学表达式为(x-2) 2 +(y-5) 2 =64的圆,欲数控铣削其内轮廓,请在下列刀具中选一把(   )。
A.
Φ18键槽铣刀
B.
Φ20键槽铣刀
C.
Φ12键槽铣刀
D.
Φ64键槽铣刀
【单选题】When educators wish to share some information with their colleagues, they often __________ .
A.
publish it in a professional journal
B.
attend professional meetings
C.
get access to it in the library
D.
make use of some library services
【单选题】Some educators try to put students of similar abilities into the same class because they believe this kind of ______ grouping is advisable.
A.
homogeneous
B.
instantaneous
C.
spontaneous
D.
anonymous
【单选题】Some educators begin to teach girls and boys separately because ______.
A.
some researches suggest that boys and girls do not study in the same way
B.
they are inspired by the success of Young Women's Leadership School
C.
researches in single-sex class prove that it works better for education
D.
problems in coeducation show that a single-sex school might be a better choice
【多选题】下列各项属于商流费用的有( )。
A.
运输费用
B.
市场信息费用
C.
信息加工费用
D.
合同谈判费用
E.
合同履行费用
【单选题】下列各项不属于费用要素内容的有(    )。
A.
销售费用    
B.
管理费用
C.
财务费用    
D.
待摊费用
【单选题】有一平面轮廓的数学表达式为(X -3) 2 +(y-5) 2 =64 的圆,欲加工其内轮廓,请在下列刀中选一把最合适的刀具( )。
A.
.φ3立铣刀
B.
φ5立铣刀
C.
φ10立铣刀
D.
φ16立铣刀
【单选题】有一平面轮廓的数学表达式为(X-2)22 + (y-5)2 = 64的圆,欲加工其内轮廓,请在下列刀中选一把( )
A.
Φ 16 立铣刀
B.
Φ20 立铣刀
C.
Φ5 立铣刀
D.
密齿端铣刀
【多选题】有关压缩机的表述下列正确的
A.
容积式压缩机工作原理是改变工作腔的容积
B.
容积式压缩机工作的理论基础是气体状态方程
C.
动力式压缩机工作的理论基础是伯努利方程
D.
动力式压缩机工作原理是改变叶轮的转速,机械能与流体能量交换。
【单选题】有一平面轮廓的数学表达式为 (X-2) 2 + (y-5) 2 = 64的圆,欲加工其内轮廓,请在下列刀具中选一把( )。
A.
Φ24立铣刀
B.
Φ20 立铣刀
C.
Φ12立铣刀
D.
密齿端铣刀
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