单项选择题

原始西瓜个头小，皮薄，味甜。（）

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多项选择题

A．UO≈24V
B．UO≈12V且不可调
C．UO可调范围变为6～12V
D．UO≈23.3V

单项选择题

Peking Opera masks serve two purposes. One is to indicate the identity and character of the role. The other purpose is to express people’s appraisal of the roles from a moral and aesthetic point of view. ( )
A. 对

B. 错