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【单选题】
Wood carving refers to the art of creating or decorating objects of wood by carving with a sharp, hand-held tool. This form. of art has a history of over 1,000 years and a unique artistic style. The following is some introduction about wood carving in America. Wood carving 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 Blancard designed a lathe which could turn irregular shapes—an innovation that made possible mass production of gunstocks, shoe lasts, oblong and square wooden wares—craftsmen who could use knife and chisel skillfully were still in demand. Some found ready employment in shops of cabinetmakers, while others, carved decoy. Still others specialized in creating shop signs, ship figureheads, or in decorating interior woodwork. A few even accepted commissions to make busts of prominent citizens. This passage most likely came from a longer work about early American ______.
A.
arts and crafts
B.
political leaders
C.
logging industries
D.
fashion design
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参考答案:
举一反三
【单选题】对于力偶,下列说法正确的是( )。
A.
由于力偶没有合力,因此,该力偶作用于物体上,可使物体平衡
B.
力偶只能用一个力来平衡
C.
力偶只能用力偶来平衡
D.
力偶对物体的作用效果与力矩是一样的
【判断题】立方氮化硼(简称CBN)是用六方氮化硼(俗称白石墨)为原料,利用超高温高压技术,继人造金刚石之后人工合成的又一种新型无机超硬材料。
A.
正确
B.
错误
【单选题】对于力偶,下列说法正确的是( )。
A.
力偶只能用力偶来平衡;
B.
力偶只能用一个力来平衡;
C.
力偶对物体的作用效果与力矩是一样的;
D.
由于力偶没有合力,因此,该力偶作用于物体上,可使物体平衡。
【多选题】关于琥珀色立方氮化硼的合成下列说法正确的是
A.
主要的原材料有六方氮化硼,氮硼化物(如氮硼化镁)
B.
需要高温高压
C.
降低氧含量有利于提高晶体品质
D.
合成组装为直热式加热
【判断题】立方氮化硼(简称(;BN)用六方氮化硼(俗称白石墨)为原料,利用超高温高压技术,继人造金刚石之后人工合成的又一种新型无机超硬材料。
A.
正确
B.
错误
【单选题】对于力偶,下列说法正确的是 ( )
A.
由于力偶没有合力,因此,该力偶作用于物体上,可使物体平衡
B.
力偶只能用力偶来平衡
C.
力偶对物体的作用效果与力矩是一样的
D.
力偶能用一个力来平衡
【单选题】下列各项运动中,没有改变生产资料私有制的是( ) (易)(第三章)
A.
对农业的社会主义改造
B.
对手工业的社会主义改造
C.
对资本主义工商业的社会主义改造
D.
土地改革运动
【简答题】立方氮化硼合成原料?
【单选题】鸡出啄癖时应在日粮中增喂B
A.
粗蛋白
B.
粗纤维
C.
代谢能
D.
糖类
【单选题】鸡出啄癖时应在日粮中增喂 ( )
A.
粗蛋白
B.
粗纤维
C.
代谢能
D.
糖类
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