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【单选题】
The narrative of facilitation diffusion is wrong ( )A.
Facilitated diffusion through carriers, such as the process of glucose entering the cell through cell membranes
B.
Facilitated diffusion through channels, such as the diffusion of K + and Na + from the high concentration side to the low concentration side of the membrane
C.
There is a high degree of structural specificity between the membrane protein as a carrier and the substance to be rotated
D.
Channel proteins are not specific for the substance being transported
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【简答题】对称三相电源,线电压 U L =380V ,对称三相感性负载作三角形连接,若测得线电流 I L =17.3A ,三相功率 P =9.12KW ,求每相负载的电阻和感抗。
【简答题】一台三相电动机,每组绕组的额定电压为220V,对称三相电源的线电压U L =380V,则三相绕组应采用( )。A. 星形联结,不接中性线 B. 星形联结,并接中性线 C. A. b均可 D. 三角形联结