------Jane, you’ve made such great efforts that you are ____ to pass the exam.------ It is very kind

题干

------Jane, you’ve made such great efforts that you are ____ to pass the exam.
------ It is very kind of you to say so, Mr. Smith.

A：easy

B：bound

C：possible

D：convenient

上一题下一题 0.0难度选择题更新时间:2019-05-06 08:27:55

B

猜想一：琴弦发出声音的音调高低，可能与琴弦的横截面积有关

猜想二：琴弦发出声音的音调高低，可能与琴弦的长短有关

猜想三：琴弦发现声音的音调高低，可能与琴弦的材料有关

为了验证上述猜想是否正确，他们找到了上表所列9种规格的琴弦，因为音调的高低取决于声源振动的频率，于是借来一个能够测量振动频率的仪器进行实验。