What area of the earth cannot be shown on a standard Mercator chart().
A. Equator
B. Areas including both North and South latitudes
C. North and South Poles
D. A narrow band along the central meridia
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要搞清楚油田动态的变化,必须首先搞清楚哪些油田静态资料资料?
减少物流成本和改进物流服务水平是企业使用第三方物流最大的利益所在。
A. 正确
B. 错误
变压器一般由外壳、铁芯、()和冷却系统等五部分组成。
A. 绕组
B. 绝缘油
C. 绝缘套管
D. 名牌
The rotary motion of a diesel engine crankshaft is obtained from the up and down motion of the piston via the ().
A. camshaft
B. reduction gears
C. rocker arm
D. connecting or piston rod