【单选题】【消耗次数：1】
明代出现了在_____基础上进行系统选育的良种繁育技术。
①
单株穗选
②
混合穗选
③
粒选
④
株选
参考答案：
复制
纠错
相关题目
【单选题】
多层螺旋CT的发明是在第三代CT的基础上进行的，采用了滑环技术。下列描述错误的是（）
①
A.X线管连续旋转
②
B.连续进床
③
C连续采集
④
D.采用低热容量球管
随机题目
【多选题】
She collected_____________ fishes for the British Museum.
①
different types of
②
different kinds of
③
various kinds of
④
many kinds of
【单选题】
This will be a good____________ for us to exchange experience.
①
opportunity
②
question
③
attitude
④
exercise
【单选题】
After Whitneys idea was applied to automobile production, each part____________ had to be made by hand.
①
no more
②
no more than
③
no less than
④
no longer
【单选题】
Between 1990 and 2000, the population of the United States increased____________ 33 million people.
①
in
②
at
③
on
④
by
【单选题】
The power station____________ its supply of electricity day and night.
①
misunderstands
②
maintains
③
measures
④
masters