皮皮学，免费搜题
登录
搜题
【单选题】
能够得到最佳的超声反射的情况是A.
入射波平行于反射界面
B.
入射波垂直于声阻抗不同的界面
C.
入射波发生绕射、衍射、折射及表面反射
D.
声束入射与反射间的夹角>90°
E.
声束入射与反射间的夹角<90°
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】(Please give your detaile answer in English. Take picture by your phone and then upload Chaoxing ) minf(x)=
【单选题】开始创业时,当有发现有很多商机时我们需要()。
A.
慎重选择符合个体和社会发展的商机
B.
排序选择最符合社会趋势的商机
C.
另辟新路
D.
随意选择个体能操作的商机
【单选题】New ice core samples taken from the centre of the Greenland ice-sheet have given a detailed record of the last 'interglacial (间冰期)' which rail from about 135,000 to 115,000 years ago. The cores, taken...
A.
The climate in recorded human history has generally remained stable.
B.
The climate from about 135,000 to 115,000 years ago was in a extremely cold state.
C.
The human race has been lucky to have enjoyed the most favorable period of climate for them to build a socio-economic system.
D.
The evidences scientists collected from the ice cores suggest that a civilization can not have arisen in the period from about 135,000 to 115,000.
【单选题】New ice core samples taken from the centre of the Greenland ice-sheet have given a detailed record of the last 'interglacial(间冰期)' which ran from about 135,000 to 115,000 years ago. The cores, taken f...
A.
The climate in recorded human history has generally remained stable.
B.
The climate from about 135,000 to 115,000 years ago was in a extremely cold state.
C.
The human race has been lucky to have enjoyed the most favorable period of climate for them to build a socio-economic system.
D.
The evidences scientists collected from the ice cores suggest that a civilization can not have arisen in the period from about 135,000 to 115,000.
【简答题】朗姆酒根据颜色的不同，主要可以分为哪几类？
【单选题】New ice core samples taken from the centre of the Greenland ice-sheet have given a detailed record of the last 'interglacial(间冰期)' which ran from about 135,000 to 115,000 years ago. The cores, taken f...
A.
The climate in recorded human history has generally remained stable.
B.
The climate from about 135,000 to 115,000 years ago was in a extremely cold state.
C.
The human race has been lucky to have enjoyed the most favorable period of climate for them to build a socio-economic system.
D.
The evidences scientists collected from the ice cores suggest that a civilization can not have arisen in the period from about 135,000 to 115,000.
【单选题】下列微生物与染色法最佳搭配,哪一项是错误的?( )
A.
白喉杆菌-Neisser染色法
B.
钩端螺旋体-镀银染色法
C.
恙虫病-Giemsa染色法
D.
新型隐球菌-墨汁负染法
E.
结核杆菌-Gram染色法
相关题目：
参考解析：
知识点：
题目纠错 0
发布
