1、从热力学角度看,扩散的真正推动力是由浓度梯度的不同引起的,各组元的原子总是由高浓度扩散到低浓度。( )
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质点按空位扩散结构进行扩散时,空位扩散活化能仅包括空位迁移能。( )
A. 对
B. 错
I' d like to order a table _____four_____this Friday.
A. to; on
B. for; for
C. for; at
D. from;in
The person who pays the bill is usually seated with his ______ to the wall.
A. hand
B. face
C. back
D. head
There are eight major Chinese cuisines(八大菜系)based on regional cooking. Theyare Shandong cuisine(鲁菜),Sichuan cuisine(川菜),Anhui cuisine(徽菜),Hunan cuisine(湘菜),Fujian cuisine(闽菜),Zhejiang cuisine(浙菜), ___________and ______________.
A. Beijing cuisine(京菜) and Huaiiyang cuisine(苏菜)
B. Shanxi cuisine(山西菜)and Huaiyang cuisine(苏菜)
Cantonese cuisine(粤菜)and Dongbei cuisine(东北菜)
D. Huaiyang cuisine(苏菜) and Cantonese cuisine(粤菜)