题目内容

疏水器是热水采暖系统中必不可少的附件。

A. 对
B. 错

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地暖安装的覆盖层厚度不宜小于50mm，并应设置伸缩缝。

A. 对
B. 错

She has done a little traveling on holidays.

A. 对
B. 错

She gets excited about going to any country.

A. 对
B. 错

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A. 对
B. 错