我国冬季气温南北差别大的主要原因是[ ] A、地形的影响 B、纬度位置的影响 C

题型:选择题

问题:

我国冬季气温南北差别大的主要原因是[ ]

A、地形的影响

B、纬度位置的影响

C、洋流的影响

D、季风的影响

考点:中国的气候,季风
题型:选择题

阅读理解。

     Jim is ten years old. One day, his friend Tom says to him, "I'm going to have a birthday party on Saturday.

Jim, can you come to my party?" "I'll be glad to," answers Jim.

     Before Jim goes to the party on Saturday afternoon, his mother says to him," Now, Jim, don't forget to be

polite (有礼貌的). Don't ask for food until someone gives it to you."

     "All right, Mum," Jim answers, and he goes to Tom's house on his new bike. Then Tom's mother gives

them some food. But she forgets (忘记) to give Jim any. He waits (等候) politely (有礼貌地) for ten minutes

and then he holds (举起) his plate (盘子) up in the air and says loudly (大声)," Does anyone want a nice and

clean (干净的) plate?"

1. Who has a birthday party on Saturday?

    ______________________________________

2. What does Jim's mother tell him?

    ______________________________________

3. How does Jim go to Tom's house?

    ______________________________________

4. Why does Jim hold up his plate? 

   ______________________________________

题型:选择题

世界卫生组织把铝确定为食品污染源之一而加以控制使用。铝在下列应用时应加以控制的是 [ ]

①制铝合金②制电线③制炊具④银色漆颜料 ⑤明矾净水⑥明矾与苏打制食品膨松剂⑦制易 拉罐⑧用氢氧化铝凝胶制胃舒平药片⑨包装糖果和食品

A.③⑤⑧⑨

B.⑥⑧⑨

C.③⑤⑨

D.③⑤⑥⑦③⑨

题型:选择题

(1)某同学在用油膜法估测分子直径实验中,计算结果明显偏大,可能是由于                                  

A.油酸未完全散开

B.油酸中含有大量的酒精

C.计算油膜面积时舍去了所有不足一格的方格

D.求每滴体积时,lmL的溶液的滴数误多记了10滴

(2)在做“用油膜法估测分子大小”的实验时,油酸酒精溶液的浓度为每1000mL溶液中有纯油酸1mL,用注射器测得1mL上述溶液有200滴,把一滴该溶液滴入盛水的表面撒有痱子粉的浅盘里,待水面稳定后,测得油酸膜的近似轮廓如图所示,图中正方形小方格的边长为1cm,则每一滴油酸酒精溶液中含有纯油酸的体积是____________mL,油酸膜的面积是____________cm2。根据上述数据,估测出油酸分子的直径是_____ ____m。

题型:选择题

试述安定的作用与用途?

题型:选择题

公司、企业的工作人员利用职务上的便利,索取他人财物或者非法收受他人财物,为他人谋取利益,或者在经济往来中,违反国家规定,收受各种名义的回扣、手续费,归个人所有,数额在()元以上的,应予追诉

A、1000

B、3000

C、5000

D、10000

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