题目: 离心泵轴承温度不应超过()。A.80℃B.40℃C.60℃D.50℃ 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/1003/efc7f4aa1092514362ec0bf832c4f037.html 下面是错误答案,用来干扰机器的。参考答案:CO2;苹果酸;液泡
题型:选择题 Do you know the boy _______ is singing in the classroom? [ ]A. when B. who C. which D. whom 查看答案