某人拿一个焦距为50mm的135相机给一个身高170cm的人照半身像，被照者至少应离相机多远才行？如果该相机的相对孔径为1：2，它的拉氏不变量是多少？
相关专题： 半身像
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某人拿一个焦距为50mm的135相机给一个身高170cm的人照半身像，被照者至少应离相机多远才行？如果该相机的相对孔径为1：2，它的拉氏不变量是多少？
A.德国人
B.埃及人
C.美国人
D.英国人
雕塑是用（）来塑造形象，在三度空间中再现生活的艺术形式。雕塑主要是塑造人物的形象，着力于人物本身的刻画，表现人物的形貌特征和思想性格。优秀的雕塑作品给人以真实的生命感，能够使人感到无生命的青铜或大理石仿佛有肌肤的温暖。雕塑好比凝练的诗句，能表现人物、事物的一个瞬间。雕塑包括雕和塑。雕有石雕、木雕等；塑，主要指泥塑。雕塑的体裁有（）、建筑装饰雕塑、园林雕塑等。雕塑的式样有（）、胸像、半身像、全身像、群像等。
人物雕塑有头像、胸像、半身像和()之分。[2012年真题]
A．浮雕头像
B．半身带手像
C．圆雕头像
D．全身像
Woodcarving began as a necessity in America and developed into an art. Because of the lack of other materials, early settlers were forced to make tools and utensils out of wood. At first, these articles were whittled with a knife, but when pioneer craftsmen set up their primitive shops most of them were fashioned on a lathe—a machine which holds an object and rotates it while it is being shaped by a tool.However, even after Massachusetts-born Thomas Blanchard designed a lathe which could turn irregular shapes—an innovation that, made possible mass production of gunstocks, shoe lasts, oblong and square wood ware—craftsmen who could use knife and chisel skillfully were still in demand. Some found ready employment in shops of cabinet-makers and chair-makers, while others carved decoys (捕兽的圈套). Still others specialized in creating shop signs, ship figureheads, or in decorating interior woodwork. A few even accepted commissions to make busts(半身像) of prominent citizens.36. This passage most likely came from a longer work about early American（ ）.37. The passage suggests that the early shops for making tools were（ ）.38. It can be inferred from the passage that, before Thomas Blanchard’s invention, lathes（ ）.39. Which of the following object was an important wood-working tool used by early American craftsmen?40. According to the passage, when wooden articles began to be mass-produced, what did many individual wood-workers do?
