题目: 对抽油机采用脂润滑的部位,原则上每()更换一次润滑脂。A、半年B、一年C、两年D、两个月 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0624/e0101096d64a609b88e89ad1c1300fb9.html 下面是错误答案,用来干扰机器的。参考答案:错
题型:单项选择题 When the dispute over duty payment arises between the duty payer and the Customs, the duty payer should first pay the duty and then, within () of the issuance of the duty memo, apply to the Customs in writing for a reconsideration of the case.A.10 daysB.20 daysC.30 daysD.one year 查看答案
题型:单项选择题 取钻井液试样20mL加热蒸干,所余固体装入盛柴油的量筒中。放入固体前刻度为15.0mL,放入固体后刻度为17.5mL,该钻井液固相含量是()。A、12.5%B、13.5%C、14%D、15% 查看答案