单项选择题
钻铤的主要特点是（）。
A.壁厚大、重量大B.壁厚大、刚度大C.壁厚大、重量大、刚度大
单项选择题 Which of the following could be an appropriate title for this passage?（）
单项选择题 Which of the following is not mentioned as a feature of the Hall of Mirrors？（）
单项选择题 about this articles which of the following is NOT true？（）
