“白露早、寒露迟,秋分种麦正适时”,这反映了农业生产的___________特点

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问题:

“白露早、寒露迟,秋分种麦正适时”,这反映了农业生产的___________特点  (    )

A.地域性

B.季节性

C.周期性

D.个体性

考点:农业生产活动对地理环境的影响工农业污染及其防治
题型:选择题

在下列短文的每个空格中填上一个合适的词,使文章的意思完整(单词的首字母已给出)。

     Mrs Jones was a teacher, her house was not far f   1    her school, and she always walked t   2   . All the

pupils in this school w   3    very young. Once Mrs Jones walked to school o   4    a very cold and windy

moming in November and the cold w   5    went into her eyes, and big tears (眼泪) began running out of t   6   .

She r   7    the school, opened the door and went into the classroom. It was nice and warm there and Mrs Jones

was happy. But then a small boy looked at her f   8    a few minutes, put his arm r   9    her and said k  10  ,

"Don't cry... This school isn't very bad, is it?"

1.________    2._________    3._________    4.________    5._________ 

6.________    7._________    8._________    9.________    10._________

题型:选择题

采购员小张买回一批酒精,放在甲、乙两个桶里,两个桶都未装满。如果把甲桶酒精倒入乙桶,乙桶装满后,甲桶还剩10升;如果把乙桶酒精全部倒入甲桶,甲桶还能再盛20升。已知甲桶容量是乙桶的2.5倍,那么,小张一共买回多少升酒精?()

A.28升

B.41升

C.30升

D.45升

题型:选择题

三相交流异步电机的结构?

题型:选择题

采空区瓦斯抽采方式分为钻孔抽采法和巷道抽采法。抽采前应加固密闭墙、减少()。

A.漏风

B.瓦斯压力

C.瓦斯含量

D.风速

题型:选择题

养护温度不得低于防冻剂规定的温度,当达不到规定温度,且混凝土强度小于()时应采取加热保温措施。

A.3.5Mpa

B.3.0Mpa

C.2.5Mpa

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