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【简答题】
绝大部分错颌畸形是儿童在生长发育过程中,由于先天的_____因素或后天的环境因素导致错颌畸形。
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皮皮学刷刷变学霸
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【多选题】光伏逆变器在规定的输入直流电压允许的波动范围内,应能输出额定的电压值,一般在额定输出电压为单相220V和三相380V时,对电压波动偏差说法正确的是( )
A.
在稳定状态运行时，一般要求电压波动偏差不超过额定值的±5%；
B.
在负载突变时．电压偏差不超过额定值的±l0%；
C.
在正常工作条件下，逆变器输出的三相电压不平衡度不应超过8%；
D.
输出的电压波形（正弦波）失真度一般要求不超过5%；
E.
逆变器输出交流电压的频率在正常工作条件下其偏差应在1%以内。
【单选题】The writing of the Constitution of the United States is an act of such genius that philosophers still wonder at its accomplishment and envy its results. Fifty-five typical American citizens met and ar...
A.
The Constitution, one of the greatest documents of the world, was written by fifty-five men of varying talents and backgrounds.
B.
The Constitution owes its greatness to the fact that it has never changed in a changing world
C.
The Constitution was written by many people working together cooperatively.
D.
The Constitution was written by many people, all of whom were thinkers of the highest order.
【简答题】已知向量 =（2m+1，3）， =（2，m），且 ∥ ，则实数m的值是（ ）。
【简答题】已知向量 = (6 , 2 ) , = ( - 3 , k ) , 且 ∥ , 则 k = ________. 2.已知向量 = (2 , 1 ) , = (3 , m ) , 且 3 = 2 , 则实数 m = ________.
【简答题】网络营销课程设计指导书.docx “一院一专业一课程一成果”申报表(骆宇明).xls
【单选题】已知向量 =（m-2，m+3）， =（2m+1，m-2），且这两个向量的夹角大于90°，则实数m的取值范围为 [ ]
A.
m＞2或m＜-
B.
- ＜m＜2
C.
m≠2
D.
m≠2且m≠-
【单选题】The writing of the Constitution of the United States is an act of such genius that philosophers still wonder at its accomplishment and envy its results. Fifty-five typical American citizens met and ar...
A.
The Constitution, one of the greatest documents of the world, was written by fifty-five men of varying talents and backgrounds.
B.
The Constitution owes its greatness to the fact that it has never changed in a changing world.
C.
The Constitution was written by many people working together cooperatively.
D.
The Constitution was written by many people, all of whom were thinkers of the highest order.
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