标准煤与标准油之间换算关系: 1千克标准煤等于()千克标准油; 1千克标准油等于()千克标准煤。
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形体美也具有()、民族性,其审美标准是不可能永恒的,一成不变的,“环肥燕瘦”就充分体现了时代的审美标准。
()都有生产和上市的季节性,婴幼儿的食欲也会受不同气温的影响,要根据季节的变化来进行调整。
A. 粮食
B. 蔬菜
C. 水果
D. 选项B和C
标准的气象地面观测场的面积为()米2,如确因条件限制也可适当按比例缩小,但不应当小于()米2。
The exhaust ports are located around the lower part of the cylinder liner, ()the products of combustion are driven by scavenging air.
A. in which
B. by which
C. through which
D. from which