当液压系统的工作压力较高时,应选用()的液压油。
A、凝点高
B、凝点低
C、粘度高
D、粘度低
参考答案:C
Thanks to Mr. Smith the father and the son eventually______________ after ten years' cold relationship between them.
A.took up
B.made up
C.looked up
D.turned up
下列不属于顺穿法穿大绳特点的是()。
A.穿绳法简单
B.二层台扣吊卡操作比较方便
C.各滑轮偏磨的可能性较小
D.各滑轮偏磨性较大