不定项选择

镗床是一种精密加工机床。

A．正确
B．错误

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单项选择题

The idea that claims in one's self-interest are credible only if they are supported by actions that would be too costly to take if the claims were untrue is known as the:

A．pecking order hypothesis
B．credibility principle.
C．lemons principle.
D．signaling theory of debt.