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第20章有下面两段话+ |$ ^! `+ g! n! a0 x
Resistors and inductors are not connected in parallel except, if an air-core inductor is used, a8 w$ j1 d% a: v8 }$ L% h. j9 |4 J
resistor taking approximately 1 % of the current through the inductor is connected in parallel
+ N6 \# S+ T2 A6 n, twith it.) M/ j% U: q6 ^
Iron-cored inductors may be used, provided the current has a substantially sine-wave form.- D+ C0 d7 t9 `$ W: e' r
For the test on three-pole accessories, three-core inductors are used.
+ V, ^% y v( q6 {问题1：如何理解上面这段话？
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; r7 N$ k% E2 I$ c. FAccessible metal parts, metal supports and any metal frame supporting the base of flush-type
2 D& w0 P j p4 Ysocket-outlets are connected through the selector switch C; for two-pole accessories, to one( ^# ^( m- L7 a- D0 |% }
of the poles of the supply for half the number of strokes, and to the other pole for the
5 I% Z+ v# S- C/ Lremainder;* j% C# d5 j" J& f9 l6 a ~
问题2：如何理解上面这段话？
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0 J; V1 u0 s. P& X3 c
" G5 Y( B: w" Q5 e- q+ S" U3 {: R) Q2 s7 Q# y, b9 w
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发表于 2015-10-23 14:18
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