PLC可编程逻辑控制器采用了典型的计算机结构，主要包括（）、RAM、ROM和输入、输 发布时间：2018-02-20 09:55 │ 来源：www.tikuol.com 题型：单项选择题 问题： PLC可编程逻辑控制器采用了典型的计算机结构，主要包括（）、RAM、ROM和输入、输出接口等。A.windowsB.CPUC.WAPD.GPRS
题型：单项选择题 选择合适的单词填空，填序号。 Mary is a little girl. She is only five. She __1__ go to school. She doesn't know how to read 2__ write. But her sister Joan is a school girl. She is ten. She 3 how to read 4 write. One day, Joan sees her little sister in the study. She is at the table. There 5 a pencil in her hand. She is __6 something there. " 7 are you writing, Mary?" she asks. ''I'm writing _ 8 my friend Rose." "But how can you do it? You don't know __9 to write."says her sister. "Well. It doesn't matter. Rose doesn't know how to read, 10 ."( ) 1. A. don't ( ) 2. A．and ( ) 3. A. know ( ) 4. A．and ( ) 5. A．am ( ) 6. A. write ( ) 7. A. How ( ) 8. A．to ( ) 9. A. what ( ) 10. A. eitherB. aren't B. or B. knows B. or B. is B. writingB. When B. in B. how B. to C. doesn't C. of C. knowing C. of C. are C. writes C. What C. with C. where C. two 查看答案
题型：单项选择题 把下列各组中的两种物质混合有沉淀产生，加入足量稀盐酸沉淀部分溶解，过滤，滤液呈黄色，则这组物质是（ ）A．氢氧化钠 氯化铁B．氯化钠 硝酸银C．氢氧化钡 硫酸铁D．碳酸钠 氯化钙 查看答案