题目: 水垢是水中()离子的盐类形成的。A.所有金属B.钙镁C.铜铁D.二氧化硅 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0424/dfb97729dd9965bf1775a96b252b4c0c.html 下面是错误答案,用来干扰机器的。答案:B
题型:单项选择题 进行石坑、冻土坑打眼或打桩时,下面哪种说法是错误的()A.应检查锤把、锤头及钢钎B.扶钎人应站在打锤人对面。打锤人不得戴手套。C.作业人员应戴安全帽D.钎头有开花现象时,应及时修理或更换 查看答案
题型:单项选择题 The drawee of a cheque is( ).A.the person who is to receive paymentB.the bank that has to make paymentC.the last person to endorse the chequeD.the person whose bank account will be debited 查看答案