1. Diagram below shows a wheelbarrow.
À¼õ ´Õ ¾ûÙÅñʨÂì ¸¡ðθ¢ÈÐ.
Which of the following simple machines can be found in the wheelbarrow?
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I Gear
Àüºì¸Ãõ
II Lever
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III Wedge
¬ôÒ
IV Wheel and axle
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A I and II C I, II and III
B II and IV D I, II, III and IV