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第20章有下面两段话! d& |" Z, s b& g: D6 }$ N2 u/ W0 R
Resistors and inductors are not connected in parallel except, if an air-core inductor is used, a2 r w" n! u9 P& B$ H2 _1 h
resistor taking approximately 1 % of the current through the inductor is connected in parallel( m) B; K1 q/ ~
with it.& k* y# M$ n/ g; K
Iron-cored inductors may be used, provided the current has a substantially sine-wave form.3 {; ?5 F; \9 z3 ~8 v# E
For the test on three-pole accessories, three-core inductors are used.
* p; g! W& S$ E2 j5 @0 `问题1：如何理解上面这段话？' T* X1 `9 y/ v" k/ R
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Accessible metal parts, metal supports and any metal frame supporting the base of flush-type: y8 q6 g, w9 `6 i# M* H9 F
socket-outlets are connected through the selector switch C; for two-pole accessories, to one* F! Z- @8 {8 |
of the poles of the supply for half the number of strokes, and to the other pole for the/ W& h! m# D7 C/ v( c. o; {. Y
remainder;
2 h; I2 N s" x$ B; K9 B1 x6 r问题2：如何理解上面这段话？
" `- `; {9 o; F9 q9 e
# r2 c8 o( ~3 j6 ^6 k9 Z! s! G" U7 W2 ^6 ]; H8 C
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发表于 2015-10-23 14:18
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