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【单选题】
触发神经末梢内囊泡释放递质的离子是A.
Na+
B.
Ca2+
C.
K+
D.
Mg2+
E.
Cl-
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【单选题】听力原文： Strikes are very common in Britain. They are extremely harmful to its industries. In fact, there are other countries in Western Europe that lose more working days through strikes every year than...
A.
They often take place in the major industries.
B.
British trade unions are more powerful.
C.
There are more trade union members in Britain.
D.
Britain has less working days through strikes every year.
【单选题】听力原文： Strikes are very common in Britain. They are extremely harmful to its industries. In fact there are other countries in Western Europe that lose more working days through strikes every year than ...
A.
They often take place in the major industries.
B.
British trade unions are more powerful.
C.
There are more trade union members in Britain.
D.
Britain loses more working days through strikes every year.
【单选题】The United Kingdom is also known by its official name
A.
the United Kingdom of Great Britain and England.
B.
the United Kingdom of Great Britain.
C.
the United Kingdom of British Isles.
D.
the United Kingdom of Great Britain and Northern Ireland.
【简答题】某研究小组为探究3种植物生长素类似物NAA、IAA和IBA对竹柳扦插生根效果的影响,进行了如下相关的实验探究: 选用一年生茁壮、无病虫害的竹柳,取长10 cm、粗0 . 2 cm的枝条若干,上端剪口平滑,下端剪口沿30°剪切,并用0 . 5%的多菌灵进行表面消毒。将3种生长素类似物分别都配制成50 mg/L、100 mg/L和200 mg/L三种浓度的溶液。将竹柳插条每10枝一组,下端插入激素溶液...
【简答题】为研究生长素( IAA )和赤霉素( GA 3 )对玉米胚芽鞘生长的影响,得到如下实验结果。请回答下列问题: ( 1 )实验中除激素的因素外,可能影响实验结果的因素为 ________ (填 “ 自变量 ” 、 “ 因变量 ” 或 “ 无关变量 ” )。图中 “ ? ” 处理方式是 ______________________________ 。 ( 2 )实验中用激素处理胚芽鞘时,应将 IAA ...
【简答题】如图所示，与图中情景相关的说法中正确的是 A．动物之间可以通过声音传递信息 B．控制公路噪声的唯一途径是减少鸣笛 C．海豚只能接收超声波 D．交响乐队中所有乐器音色完全相同
【单选题】The UK ________ Great Britain and Northern Ireland, is a country famous _____ its history.
A.
consisted of, for
B.
consisting of, as
C.
consisting of, for
D.
consisted of, as
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