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【单选题】
同源三倍体的育性为( )。
A.
正常可育
B.
部分不育
C.
半不育
D.
高度不育
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举一反三
【单选题】若 int a[3][2]={{123,345,334},{1,2},{3,4}}; 则 a[2][1]= ( )。
A.
1
B.
3
C.
2
D.
4
【单选题】What happened after Lincoln's assassination?
A.
The Civil War ended
B.
The Thirteenth Amendment became law
C.
Andrew Johnson was killed
D.
More states secreded from the Union
【单选题】对 一 般硬度的钢材进行高速切削应选择 ( ) 。
A.
高速钢刀具
B.
涂层硬质合金刀具
C.
工具钢刀具
D.
陶瓷刀具
【单选题】对一般硬度的钢材进行高速切削应选择()
A.
高速钢刀具
B.
立方氮化硼(CBN)刀具
C.
涂层硬质合金刀具
D.
陶瓷刀具
【单选题】若int a[3][2] = {{123,345},{23,56},{34,56}},则a[2][1] = ( )。
A.
23
B.
34
C.
56
D.
123
【单选题】What happened after the Wright brothers’success?
A.
People carried out a systematic study on pigeons.
B.
People studied more animals and plants to develop the airplane.
C.
People could fly their airplane for fun.
D.
People kept their airplane at a French gallery.
【单选题】What happened after the WrightBrothers’success?
A.
People Carried out a systematic study on pigeons.
B.
People Could fly their airplane for fun.
C.
People kept their airplane at a French gallery.
D.
People studied more animals and plants todevelop the airplane.
【判断题】虞美人茎、叶、花梗的质感比罂粟粗。
A.
正确
B.
错误
【单选题】对一般硬度的钢材进行高速切削应选择( )。
A.
高速钢刀具
B.
立方氮化硼刀具
C.
涂层硬质合金刀具
D.
陶瓷刀具
【简答题】What happened after the message of seeing a Vermivora chrysoptera was put on the network?
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