皮皮学，免费搜题
登录
搜题
【单选题】
关于声波的分类及其应用,正确的是:A.
超色波的波长很短，所以其频率很大，方向性不好
B.
次声波的波长很长，其频率很小，所以方向性很好
C.
红外线的波长比红光还要长，所以其衍射效果很好，可以用在很多探测和跟踪上面
D.
紫外线的频率比紫光更大，具有很强的热作用，比如说微波炉等
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【判断题】设函数【图片】在点【图片】的某一邻域内具有连续偏导数，且【图片】，【图片】，则方程【图片】在点【图片】的某一邻域内恒能唯一确定一个具有连续导数的函数【图片】.
A.
正确
B.
错误
【单选题】● A well-designed system should be（73）. ①easily understood ②reliable ③straightforward to implement ④straightforward to maintain （73）
A.
①②
B.
①③④
C.
②③④
D.
①②③④
【单选题】The art exhibition was well-designed ______ the disarrangement of a few photos.
A.
except
B.
except for
C.
except that
D.
in addition to
【简答题】It can be inferred from the text that [A] the effect of a well designed graph might be very small. [B] the new pyramid is definitely doomed to be a failure. [C] political influence will never be waved...
【简答题】__________ (从艺术家的角度来看), the picture is well designed.
【单选题】___________ it is well designed, it will be in equilibrium and will work efficiently.
A.
As long as
B.
As well as
C.
As soon as
D.
As possible as
相关题目：