砂轮切割简捷,效率高,操作简便,因而广泛用于切割()等型材,尤其适用于切割不锈钢、轴承钢等各种合金钢。
参考答案:角钢、槽钢、扁钢、钢管
Remove the batteries when they become weak or when the unit is not in use for extended periods. This will damage to the unit from battery leakage at such times.
A.disappoint
B.concern
C.instruct
D.prevent
长日照花卉是指生长、开花需要14小时以上的光照长度的花卉。