第28题: [单项选择]不进行风钻试运转会造成哪些伤害?() A. 不能正确钻进方向 B. 易发生断钎伤人 C. 在煤层中打眼时,煤岩粉排不出来,造成卡钎 参考答案:B
第29题: [单项选择]What is the lowest price the man can buy the machine for A. $10,000 B. $15,000 C. $13,000 参考答案:B 答案解析:[听力原文] F: ... and this machine is fifteen thousand dollars. M: What does that include F: F