单项选择题

如果三元催化转换器良好，后氧传感器信号波动( )。
A、频率高
B、增加
C、没有
D、缓慢

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单项选择题

1. Some teachers teach reading by introducing new vocabulary and structures first and then going over the text sentence by sentence and paragraph by paragraph. This way follows the ______ model.
A、bottom-up
B、top-down
C、schema-driven
D、interactive

单项选择题

人民大表大会制度我国的根本制度。（）

A. 对

B. 错