下图是熟黑芝麻包装袋上的部分说明,请回答下列问题: (1)表中该食品提供能量的

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问题:

下图是熟黑芝麻包装袋上的部分说明,请回答下列问题:

(1)表中该食品提供能量的营养素有_____________, 该食品没有提供的营养素为___________;

(2)①表中的钙、铁是指(填字母序号,下同)____________;

A.分子 B.原子 C.元素 D.单质

②当人体内缺少钙、铁时,可能患有的疾病是______________;

A.食欲不振 B.骨质疏松 C.夜盲症 D.贫血病

(3)某同学关注到食品包装材料的化学成分opp、cpp,经上网查阅资料获知,它们是两种不同的聚丙烯。由此判断该食品包装材料属于_______________。

A.合金 B.塑料 C.合成纤维 D.合成橡胶

考点:化学元素和人体健康六大营养素合成有机高分子材料
题型:填空题

消防车道上空有障碍物时,其净高不应小于()m。

A.3.5

B.4

C.4.5

D.5

题型:填空题

阅读并回答问题。                                          

                                                          An American Girl

     Mary is an American schoolgirl. She is now in Beijing with her parents. Mary doesn't know Chinese, 

but she is studying Chinese. She often speaks Chinese to her Chinese friends. Sometimes they don't

understand her because she can't speak Chinese well.

     It's Sunday morning. She goes out. She is walking in the street. She is going to go to the zoo to see

elephants and monkeys, but she doesn't know how to get there. She asks a Chinese boy. The boy can't

understand her. Then she takes out a pen and a piece of paper. She draws an elephant on it,  and shows

the picture to the boy. The boy understands now, and he shows Mary the way to the zoo.      

1. Where is Mary from?

     ______________________________________________

2. Can Mary speak Chinese very well?

    ______________________________________________

3. Where is Mary going to go?

    ______________________________________________

4. How does Mary make the boy understand her?

    ______________________________________________

5. Does Mary know the way to the zoo at last?

    ______________________________________________

题型:填空题

(已知△ABC所在平面外一点P到△ABC三顶点的距离都相等,则P在平面△ABC内的射影是△ABC    

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示值误差是指计量器具的()与()之差。

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某泵站有一台28ZLB-70型轴流泵,在实地测量后得流量为3850t/h,扬程为4.6m,轴功率为58.5kW,请问这台水泵的效率应该是多少?

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