51. Which of the following capacitors has polarity？
(A) Ceramic capacitors
(B) Plastic film capacitors
(C) Electrolytic capacitors
(D) Polystyrene film capacitors

41. If you want to take material from a 0.8 x 1.8 x 15cm waste wood strip to make a small wood block as shown on the right, the square side length of this wood block is 1.8cm, and the hole in the middle is Ø 5.5mm. Which one is the proper working procedure？ (A) Drill first and then saw (B) First saw and then drill (C) Simultaneous sawing and drilling (D) The order of sawing and drilling does not matter

42. What is the correct name of component A？ (A) Resistor (B) Inductor (C) Diode (D) Sensor

43. What are the correct name and symbol of component B？ (A) Plastic film capacitor, (B) Ceramic capacitor, (C) Electrolytic capacitor, (D) Electrolytic capacitor,

44. What are the correct name and symbol of component D？ (A) Resistor, (B) Transistor,(C) Transistor, (D) Capacitor,

45. What is the correct name of component E？ (A) Capacitor (B) Diode (C) Light emitting diode (D) Transistor

46. When testing ,what should the range of selection button and the red and black probes be？ (A) B20, p, o (B) C200K (or C20K or C2000K), p, o (C) C200, p, o (D) H, p, o

47. When testing ,what should the range of selection button and the red and black probes be？ (A) H (or C200), q, r (B) H, r, q (C) C20K, q, r (D) C2000K, q, r

48. When testing , what should be the range of selection button and the red and black probes be？ (A) B20 (or G9V), t, s (B) H, t, s (C) D200, t, s (D) G1.5V, s, t

49. The color of the four codes on this resistance is "orange, orange, brown and gold". What area should the range selector turn to when testing, so that it can be read more accurate values？ (A) C200 (B) C2000K (C) C200K (D) C2000

50. When testing the quality of a small DC light bulb, if you turn the range selector of the digital multimeter to 200 in the ohm range, and then touch the test rod to the top of the bulb thread and the thread respectively, the panel value will show "5.7", what is the resistance value of the bulb？ (A) 5.7KΩ (B) 5.7Ω (C) 5.7MΩ (D) This bulb is broken and cannot be measured

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