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第20章有下面两段话
: ]' ?5 k; e& _$ ~Resistors and inductors are not connected in parallel except, if an air-core inductor is used, a
& B! c& c- C# W! Z5 e& Vresistor taking approximately 1 % of the current through the inductor is connected in parallel
7 Y, E/ B& c G+ f# vwith it.
_+ k& B0 e: B2 xIron-cored inductors may be used, provided the current has a substantially sine-wave form.
0 y+ M8 l- [* X+ I/ _For the test on three-pole accessories, three-core inductors are used.# h( ?7 c& F, w5 V/ a
问题1：如何理解上面这段话？2 o2 f- z( ~; f5 p2 V% y& J' Z$ \
( V$ A( E9 m& A# N a# N
Accessible metal parts, metal supports and any metal frame supporting the base of flush-type
. Y! p* k- L9 {) M1 h6 ssocket-outlets are connected through the selector switch C; for two-pole accessories, to one- u8 D* M( B8 K w
of the poles of the supply for half the number of strokes, and to the other pole for the
, t b7 b$ e5 ^remainder;' H4 Y1 x3 Y N: ?0 E6 L
问题2：如何理解上面这段话？6 g6 P6 p+ l! d8 A- h0 a) Y
/ I8 i) {) |( R- j! N \9 A/ X
. [) i. n+ s3 T5 N8 z
6 w* D' ~7 _. S7 E$ ^6 X( b; r |
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发表于 2015-10-23 14:18
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