单项选择题
Wire rope should be greased （）when not in use.
A. every half a month B. every month or two C. every half a year D. every year
单项选择题 Coil left-handed ropes （）.
单项选择题 Coil the right-handed ropes（）.
单项选择题 In stowage, keep nylon rope away （）heat and strong chemicals.
