判断通电导体磁场方向时,应当是()握住通电导体,()指向电流方向,()的方向是磁场方

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问题:

判断通电导体磁场方向时,应当是()握住通电导体,()指向电流方向,()的方向是磁场方向。

考点:煤矿电机车司机考试煤矿电机车司机考试题库
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某校九年级举行了一次数学测验,为了估计平均成绩,在619份试卷中抽取一部分试卷的成绩如下:

有1 人100 分,2人90 分,12人85分,8 人80分,10人75分,5人70分。 

(1)求出样本平均数、中位数和众数;   

(2)估计全年级的平均分。

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五四运动最重要的贡献在于[ ]

A.迫使北洋军阀政府释放被捕学生

B.迫使北洋军阀政府罢免卖国贼的职务

C.促使中国人民觉醒,唤起国人的爱国热忱

D.迫使北洋军阀政府拒绝在对德和约上签字

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语法填空。

     阅读下面短文,按照句子结构的语法性和上下文连贯的要求,在空格处填入一个适

当的词或使用括号中词语的正确形式填空,并将答案填写在1~10的相应位置上。

     The story happened in Japan _1 a house was redecorated and the wall inside a room was removed.

The inside of the wall was hollow. When the owner of the house removed the wall, he saw a gecko (壁

虎) inside the wall. Its tail was pinned by a nail _2  (come) through the wall from outside.  

     The owner was very curious why the gecko was still alive. Then the nail caught his eye. Goodness! It

is the nail that was driven here ten years ago when the house was built! How amazing it is _3 the gecko

to have lived in the wall in complete_4 (dark) for ten years!

     But on second thought, the curious house owner wondered how this gecko could live through 10

years with its tail _5  (nail) down and being unable to go anywhere? So he tried to find out how this small

creature could be fed. After a little while, there appeared another gecko with food in _6 mouth! What a

shocking scene! For ten years, this little gecko had never failed to feed the trapped one.

     The story touched me so 7 (deep) that it is useless to find out _8 relationships they had between them. Parent _9  child ? Friends? Lovers? Brothers or sisters? 10  last thing we should do is to abandon your

beloved in hardship.

题型:填空题

技术创新的风险主要表现在创新过程的()上。

A.前沿性

B.不可预测性

C.高度不确定性

D.不可控性

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温室农业是现代农业的重要形式。读图,回答下列各题。

2014年7、8月,南京郊区农民给蔬菜大棚覆盖黑色尼龙网,其目的是()

A.增加大气逆辐射,减低夜间的温度

B.阻止地面辐射,防止夜间温度过低

C.增强地面辐射,提高农作物存活率

D.削弱太阳辐射,减少作物水分蒸发

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