日本最古老的公司是（）。 ["佳能","松下","金刚组","丰田"]
能否利用磁力起动器对电动机进行短路保护。（） ["不能","能","不能确定，要视情况而定","只要将磁力起动器的触头接触压力调大点就可以了"]
北美洲的气候有哪些基本特征？为什么说这里以温带大陆性气候占优势？
1976――1983年期间曹德旺在高山玻璃厂担任什么职位（）。 ["办公司主任","厂长","采购员","运输员"]
The lengthening of a crack formed in the shell plating of a ship may be prevented by （）. ["welding brackets across both ends of the crack","chipping out and slot welding the entire crack","drilling a hole at each end of the crack","cutting a square notch at each end of the crack"]
洋流对北美洲的气候有什么影响？
