单项选择题
If you say “ I enjoy bicycle riding”, you are making a statement about your personal like. It is a statement about ________.
未知题型 枝节匹配实验中，在主传输线上并联一个短路面位置可调的支路传输线，相当并联一个可变电抗
单项选择题 Which of the following belongs to the scope of welding inspection?
未知题型 初创企业特征包括市场性
