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参考答案：站机
By age 7 months, an infant most likely will develop which of the following motor skill
A．Walk with one hand held.
B．Eat successfully with a spoon.
C．Stand while holding onto furniture.
D．Sit alone using the hands for support.
采用的观测仪器要符合规范技术标准是（）。
A.性能良好
B.检定合格
C.安装准确
