问题 单项选择题

轴端外螺纹简画法的画线要求是()

A、内粗外细

B、外细内粗

C、外虚内粗

D、外粗内细

答案

参考答案:A

综合

读“美洲图”,回答下列问题:

(1)填出图中字母所代表的地理事物的名称:

    A____________山脉    B____________山脉    C____________山脉

    E____________河流    G____________岛屿    H____________群岛

(2)D高原大部分地区属于____________气候区,F河主要流经____________气候区。

(3)在北美洲中部为什么冬季寒冷的气流能长驱南下,并直达墨西哥湾沿岸?

                                                                                                                                                             

                                                                                                                                                            

(4)为什么亚马孙河水流平缓,水量特别丰富?

                                                                                                                                                              

                                                                                                                                                           

填空题