()具有使用温度范围宽、在真空中能发挥良好的润滑作用,抗辐射,抗腐蚀,不污染环境等特点。
A.润滑油
B.润滑脂
C.锂基脂
D.固体润滑剂
参考答案:D
如何处理老人免费卡进出站码错误、超时无法正常通过闸机?
I would rather you did some reading while you are free, but you ______. [ ]
A. don't
B. didn't
C. wouldn't
D. weren't