Zhang Heng's Guide car uses ______principles and gears.
A: mechanical
B: artistic
C: life
D: economic
A: mechanical
B: artistic
C: life
D: economic
举一反三
- Zhang Heng's Guide car is made up of a four wheeled single-shaft.
- Zhang Heng also invented the Guide Chariot.
- A small car is more ________ than a large car, because it uses less petrol. A: economical B: economic C: thrifty D: advantageous
- 以下的xml文档片段中，属性符合XML语法规则的是（）。 A: ＜car name=”zhang’s car”＞ B: ＜car name=’zhang”s car’＞ C: ＜car name=’jieda car ”＞ D: ＜car name=jieda ＞
- Zhang Heng invented the world’s first water-powered armillary sphere and the world’s first seismometer.