A.正确
B.错误
假定f(x)定义在[a,b]上,又x1,x2,x3,t1,t2,…,tn是[a,b]中互异的点,证明下列差商关系成立:
(x1-x2)f[x1,x2,t1,t2,…,tn]
+(x2-x3)f[x2,x3,t1,t2,…,tn]
+(x3-x1)f[x3,x1,t1,t2,…,tn]=0. (4.41)
A.35.26V
B.212.57V
C.367.17V
D.220V
A.J9,J5,J6b,J10,J3b
B.J9,J11,,J6b,J10,J3b
C.J9,J7,J6b,J10,J8
PN/kW | UN/V | IN/A | coseφN | nN/r/min | 接法 | Ist/IN | Tst/TN | Tm/TN |
28 | 380 | 58 | 0.88 | 1455 | △ | 6 | 1.1 | 2.3 |