单项选择题

A．A
B．B
C．C
D．D

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不定项选择

差动变压器式位移传感器中两个次级线圈要求正向串接

A．错误
B．正确

单项选择题

14. Echo’s smile _______ as she realized that Narcissus was not attracted to her.
A、slowed
B、appeared
C、 faded
D、weakened