地暖安装的覆盖层厚度不宜小于50mm，并应设置伸缩缝。
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She has done a little traveling on holidays.
A. 对
B. 错
She gets excited about going to any country.
A. 对
B. 错
She loves to travel to different countries.
A. 对
B. 错
As an expectation leader., he often works in the United Kingdom.
A. 对
B. 错
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