第4题: [单项选择]二进制数101001转换成十进制整数等于 A. 41 B. 43 C. 45 D. 39 参考答案:A 答案解析: [解析]
二进制数转换成十进制数的方法是将二进制数按权展开: (101001)2=1×25+0×24+1×2 第5题: [单项选择]Questions 50-52 refer to the following conversation. Who most likely are the speakers A. Former classmates B. Neighbors C. Colleagues D. Husband and wife 参考答案:C 答案解析:[解析] 50-52 W: I have heard you’re being sent to Madrid for the annual conference. Is that true 第6题:[单选题]检查煤气管道、液化气瓶的泄漏情况,防止发生( )伤人事故。 A.爆燃 B.轰燃 C.闪燃 参考答案:A