【評論主題】729.下列何種材料的切屑最難折斷？ (A)低碳鋼　(B)灰鑄鐵　(C)高碳鋼　(D)黃銅。

【評論內容】低碳鋼太軟 易產生BUE，切削性不良高碳...

【評論主題】729.下列何種材料的切屑最難折斷？ (A)低碳鋼　(B)灰鑄鐵　(C)高碳鋼　(D)黃銅。

【評論內容】低碳鋼太軟 易產生BUE，切削性不良高碳...

【評論主題】7. A research study showed that by the end of 5th grade, children who didn’ t read over their summer

【評論內容】

leave behind  v.留下 遺留 超過

lag behind    落後； 逾期付款； 落後於； 退步