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【单选题】Knitting My mother knew how to knit (编织), but she never taught me. She assumed, as did many women of her generation, that knitting was no longer a skill worth passing down from mother to daughter. A c...
A.
speed up
B.
give up
C.
slow down
D.
build up
【单选题】超声波传感器有（）个针脚，分别是（）。
A.
2；VCC、GND
B.
3；VCC、GND、Echo
C.
3；VCC、GND、Trig
D.
4；VCC、GND、Trig、Echo