单项选择题

腹直肌属于（）
A、短肌
B、扁肌
C、长肌
D、轮匝肌

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单项选择题

希望抑制50Hz的交流电源干扰，应选用中心频率为50Hz的（）滤波电路。‎

A．低通
B．高通
C．带通
D．带阻

单项选择题

Why has corset been popular among women even in modern days?‌

A．Because it is a symbol of a person’s social class
B．Because it accentuates the shapely curve of a woman
C．Because it is inexpensive and pretty
D．Because woman’s hourglass shape is considered as having the utmost aesthetic value