Drawing a picture is the simplest way of putting an idea down on paper. That is (21) men first began to write, six thousand years ago or (22) . The alphabet we now use (23) down to us over a long period of time. It was developed from the picture-writing of ancient Egypt.
Picture-writing was useful in many (24) . It could be used to express ideas as well as (25) . For example, a drawing of a (26) meant the object "man". (27) a drawing of a man lying on the ground with a spear in him meant " (28) "
Besides the Egyptians, the Chinese (29) the American Indians also developed ways (30) writing in pictures. But only (31) much could be said as follows. Thousands of pictures would have been needed (32) express all the ideas that people might have. It would have shown many thousands more to express all the objects (33) to men. No one could
A. many
B. some
C. that
D. such
| {{B}}
Consumer Goods{{/B}} Consumer products are goods and services destined for the final consumer for personal, family, or household use. Consumer goods were first classified about 65 years ago by Melvin T. Copeland. His three-category system of convenience, shopping and specialty goods is widely employed today. The system is based on shoppers awareness of alternative products and their characteristics prior to the shopping trip and the degree of search shoppers will undertake. It is important to recognize that placing a product into one of these categories depends on the shopper’s behavior. Convenience goods are those purchased with a minimum of effort, because the buyer has knowledge of product characteristics prior to shopping. The consumer d [单选题]三视图中,主视图和左视图应()。
A.长对正 B.高平齐 C.宽相等 D.位在左(摆在主视图左边) [判断题]若无法观察到停电线路、设备的断开点，应有能够反映线路、设备运行状态的电气和机械等指示。
A.正确 B.错误 [单选题]有限空间后，作业人员应将（）作业设备和工具带离有限空间。
A.救援 B.全部 C.检测 [单项选择]符合阴虚火旺心悸的是（）
A. 心悸时作时止、舌红、苔黄腻 B. 心悸不安、舌质紫暗 C. 心悸眩晕、胸闷痞满或水肿 D. 心悸气短、面色无华 E. 心悸易惊、舌红、苔少或无 [单选题]《建设工程安全生产管理条例》规定,分包单位应当服从总承包单位的安全生产管理,分包单位不服从管理导致生产安全事故的,由分包单位承担( )。
A.主要责任 B.连带责任人 C.共同负责次要责任 D.部分责任 [判断题]防蜂服具有防蜂蜇、防蚊虫叮咬、防割、防穿刺、防水的性能,有的防蜂服还具有防火、防毒的功能。( )(易)
A.正确 B.错误 [单选题]各种紧急制动时，动力车在（ ）km/h速度范围内自动撒砂。
A.10-70 B.15-70 C.10-80 D.15-80 [填空题]对周期信号进行（）截断，这是获得准确频谱的先决条件。
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