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第20章有下面两段话
" t% E6 P. d# V* [4 MResistors and inductors are not connected in parallel except, if an air-core inductor is used, a
; i7 u& A4 D( V8 ]% M$ K0 U4 Rresistor taking approximately 1 % of the current through the inductor is connected in parallel6 V# e: R" p8 _/ y! Z( J6 \
with it.$ p) z# `( X2 `/ R) d1 d
Iron-cored inductors may be used, provided the current has a substantially sine-wave form.+ v2 e6 G6 E- `9 r/ N0 ~
For the test on three-pole accessories, three-core inductors are used.8 \6 _ z8 H$ _
问题1：如何理解上面这段话？
* K) z. v5 _! w6 J+ B
: \9 P, c* Z. L& xAccessible metal parts, metal supports and any metal frame supporting the base of flush-type( T# ^, o1 Y3 S" n: O; M% ^1 ^
socket-outlets are connected through the selector switch C; for two-pole accessories, to one* A4 j5 A. G4 S& u" X% D( t: ^
of the poles of the supply for half the number of strokes, and to the other pole for the
3 k8 g1 Z* {/ Vremainder;# c t# G3 X0 b& l- \8 @* \
问题2：如何理解上面这段话？
0 m4 E0 D4 }' c% [) O+ _! f6 Z) `0 D* P& b# Q
* K6 f- F$ Y# [
0 p1 J, D' a+ w/ s# p |
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发表于 2015-10-23 14:18
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