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第20章有下面两段话0 o: S: n6 N, P# q8 i: l5 o
Resistors and inductors are not connected in parallel except, if an air-core inductor is used, a5 R% O; ~9 f) a s) X! O
resistor taking approximately 1 % of the current through the inductor is connected in parallel% i2 m- X6 ]) q
with it.2 g( V7 A& L- {6 R
Iron-cored inductors may be used, provided the current has a substantially sine-wave form.0 D5 n$ N) w$ R' t" G
For the test on three-pole accessories, three-core inductors are used.
# a0 b; ]6 A% m+ m* O$ ?问题1：如何理解上面这段话？
! ~8 Q, d/ H! R( ^0 O* N" p) ?! I0 H* _5 {! y! n7 F1 C
Accessible metal parts, metal supports and any metal frame supporting the base of flush-type; i9 |: H$ r0 i- H- k! N5 l
socket-outlets are connected through the selector switch C; for two-pole accessories, to one
& L" H" U0 }/ \' Y, tof the poles of the supply for half the number of strokes, and to the other pole for the1 x7 j6 O3 E* e
remainder;% V+ z/ n4 y4 f0 w8 }8 E
问题2：如何理解上面这段话？0 k# C1 E" l7 \. m: r
0 U5 W$ K) y& Y: c& a) |4 u
7 h- S1 b3 n- E* ^/ `0 B
- \2 S) v$ S; E3 l }
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发表于 2015-10-23 14:18
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