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第20章有下面两段话* C0 a w3 C& u# v
Resistors and inductors are not connected in parallel except, if an air-core inductor is used, a
, g+ s. @' m. ]/ o- k8 [resistor taking approximately 1 % of the current through the inductor is connected in parallel, O! c9 `- d. C
with it., L6 h5 g# r1 O; U1 N
Iron-cored inductors may be used, provided the current has a substantially sine-wave form.9 k! U: p9 k" { ~# I0 ?: U) m
For the test on three-pole accessories, three-core inductors are used.: K9 m, [& Z7 L& X) k, D7 R
问题1：如何理解上面这段话？
, q, R& J- U6 C! \8 a, Z' L% b4 P& z# [- k9 E" D
Accessible metal parts, metal supports and any metal frame supporting the base of flush-type
# }: g2 e* g" L6 Vsocket-outlets are connected through the selector switch C; for two-pole accessories, to one
( g. o+ z* ~* B' f1 \3 {of the poles of the supply for half the number of strokes, and to the other pole for the! E( c* t1 m+ \) D' G; |2 \0 R6 i
remainder;
+ W- ^% r8 N& ~( K问题2：如何理解上面这段话？: ?2 y' u- C# `0 }3 q! @
, ^- }1 ]; a9 y1 Z! y% t: r! C9 z' l P
* l, A1 M5 Z Z
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发表于 2015-10-23 14:18
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