标志毛泽东思想初步形成的著作是（）。A．《中国的红色政权为什么能够存在？》 B．《井冈山的

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38. Dan and his girl friend are going to travel in China. They are looking for an   online shop where they can buy some clothes of Chinese styles. His girlfriend is crazy about Qipao. 39. Ann has just bought a new house. She wants to paint it with some environment-friendly products. She doesn’t care about the price as long as the products are good. 40. Lucy has just graduated from college. Most of her clothes are sports ones. She plans to buy some professional blouses for all kinds of job interviews. 41. Mr. Black’s daughter will give birth to a baby in about three weeks. He  can’t wait to buy some lovely clothes and gifts for her. A. Adorable Muslimah It offers young women modern fashionable blouses to meet modern working women’s needs. At very affordable prices our store has set great aims for young women to look professional. B. Shanghai Based online shop It offers oriental products at good prices. One-stop shopping for beautiful Chinese clothing including custom-made man’s kung fu uniform and woman’s dresses (Qipao). C. Patty Cake Fashions It offers lovely original handsome baby clothing and gifts including handsome blankets with special designs handmade sweaters and many more children’s gifts that will be loved for years. D. At Bambino Land We have chosen all kinds of eco-friendly products. Visit our store to choose wonderful products to beautiful house. The price of the products in our store is a bit higher but you’ll find it’s worth it.  

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螺旋千斤顶是一种常用的起重装置（如图所示），用手柄转动螺杆时，螺杆顶端的重物就随螺杆一起上升．若螺杆的直径为D，螺距为h，手柄末端到转轴的距离为l，要举起质量为M的重物时，至少要给手柄顶端多大的力？指出本题中为了省力应用了哪几种简单机械．

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