条形码是1949年美国两位工程师用代码自动识别()。
A.化工项目
B.药品项目
C.纺织项目
D.图书项目
E.食品项目
参考答案:E
根据短文内容及首字母写出单词.(5分)
We each have a memory. That’s why we can still remember things a________(1) a long time. Some people have very g________(2) memories and they can easily learn many things, but some people can only r_________(3) things when they say or do them again and again. Many of the great men of the world have amazing memories.
A good memory h_________(4) people learn a language(语言) well. Everyone learns his mother language (母语) when he is a small c_________(5). He hears ,sounds, remembers them and then he learns to s_________(6). Some children are living with their p________(7) in foreign (外国的) countries. They can learn t________(8) languages as easily as one language because they hear, remember and speak two languages every day. In schools it is not so e________(9)to learn a foreign language because the students have so little time for it, and they are b_________(10) with other subjects, too.
扳动制冷装置设有电加热延时元件的油压差控制器的试验扳手,以下说法中正确的是:().
A.压缩机油压下降、立即停车
B.压缩机油压下降、延时停车
C.压缩机油压不下降、立即停车
D.压缩机油压不下降、延时停车