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最佳答案：A good English learner should know how to use a dictionary.
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最佳答案：This product has already reached or exceeded the international universal standar
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最佳答案：通过调整螺旋角到0.0或调整右旋螺纹可以更简单地更换砂轮.通过砂轮架转动可以调整螺旋角的角度,因为此时断定为螺旋角,因为螺旋角和螺旋纹都可以对轮轴进行松紧.
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最佳答案：1 For him,it is more important to lead a happy life.2 I don't know/wonder how to
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最佳答案：1.Later,I only know that we agree the time is 9:50.2.Try to relax on the table w