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【单选题】
______电池转换效率较高,寿命长,工艺相对简化。A.
单晶硅
B.
多晶硅
C.
非晶硅
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举一反三
【单选题】下列关于飞机安全飞行,叙述不正确的是()。
A.
飞机应在对流层飞行，以避免机鸟相撞
B.
—架飞机失事,有关部门都需寻找黑匣子
C.
飞机起飞时不要开手机，以免影响飞机导航系统
D.
飞机出行莫祝“一路顺风”是因为逆风有利于飞机的起飞降落
【单选题】Which is NOT the reason of reduction of the price at 5 percent?
A.
The Japanese producer holds a large quantity of stores and can' t sell them out.
B.
The Japanese have improved their production means.
C.
They can mm out more products.
D.
They expect to go on dealing with the Irish in the coming year.
【多选题】在1919年五四运动至1949年新中国成立以前这个时期,社会的主要矛盾是( )。
A.
帝国主义和中华民族的矛盾
B.
资产阶级和无产阶级的矛盾
C.
封建主义和人民大众的矛盾
D.
人民日益增长的美好生活需要和不平衡不充分的发展之间的矛盾
【单选题】Which is NOT the reason of reduction of the price at 5 percent?
A.
The Japanese producer holds a large quantity of stores and can't sell them out.
B.
The Japanese have improved their production means.
C.
They can turn out more products.
D.
They expect to go on dealing with the Irish in the coming year.
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