皮皮学，免费搜题
登录
搜题
【多选题】
下列关于声线的描述，正确的有（ 　 ）。
A.
与等相位面垂直的射线称为声线
B.
声线途经的距离代表波传播的距离
C.
声线经历的时间代表波传播的时间
D.
声线携带的能量为波传播的声能量
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
【单选题】The chief cause of loss for the nursery crops before marketed may be _____________ .
A.
desciccation during storage
B.
warming during storage
C.
lacks of cold-storage facilities at retail outlets
D.
all of the above
查看完整题目与答案
【单选题】纸蝴蝶书签的动力翅膀弯折的夹角是( )
A.
150°
B.
180°
C.
120°
查看完整题目与答案
【单选题】Which type of the nursery crops is spruce? _____________
A.
roses
B.
broad-leaved evergreens
C.
deciduous plants
D.
coniferous evergreens
查看完整题目与答案
【单选题】What's the public opnion about the nursery staff?
A.
They should focus on managing the parents.
B.
They should focus on caring for the children.
C.
They should send more reports to the nursery.
D.
They should send more pictures to the parents.
查看完整题目与答案
【判断题】Industrial jobs have more risks than office jobs.
A.
正确
B.
错误
查看完整题目与答案
【单选题】幼儿园工作规程明确指出,幼儿一日活动的组织应()注重幼儿的实践活动,保证幼儿愉快的有益的自由活动
A.
重点突出
B.
分清轻重缓急
C.
动静交替
D.
合理安排
查看完整题目与答案
【单选题】The ____ of new scientific discoveries to industrial production methods usually makes jobs easier to do.
A.
addition
B.
association
C.
application
D.
affection
查看完整题目与答案
【简答题】A．They had lost their jobs as a result of the Industrial Revolution. B．They had been suffering from political and religious oppression. C．They wanted to flee from the widespread famine in Northern Eur...
查看完整题目与答案
【单选题】What is the environmental benefit of GM crops?
A.
Herbicidetolerant crops can reduce the use of chemicals.
B.
Herbicidetolerant crops can use milder chemicals.
C.
Bt genes can protect crops against insects instead of chemical pesticides.
D.
Insect-resistant crops only need a more benign mix of chemicals .
查看完整题目与答案
【简答题】What does the field grower of nursery crops purchase from some specialfirms for field plantings? _____________A. small plants started in plant bands B. slightlly larger ones in containers C. lining ou...
查看完整题目与答案
相关题目：
【单选题】The chief cause of loss for the nursery crops before marketed may be _____________ .
A.
desciccation during storage
B.
warming during storage
C.
lacks of cold-storage facilities at retail outlets
D.
all of the above
查看完整题目与答案
【单选题】纸蝴蝶书签的动力翅膀弯折的夹角是( )
A.
150°
B.
180°
C.
120°
查看完整题目与答案
【单选题】Which type of the nursery crops is spruce? _____________
A.
roses
B.
broad-leaved evergreens
C.
deciduous plants
D.
coniferous evergreens
查看完整题目与答案
【单选题】What's the public opnion about the nursery staff?
A.
They should focus on managing the parents.
B.
They should focus on caring for the children.
C.
They should send more reports to the nursery.
D.
They should send more pictures to the parents.
查看完整题目与答案
【判断题】Industrial jobs have more risks than office jobs.
A.
正确
B.
错误
查看完整题目与答案
【单选题】幼儿园工作规程明确指出,幼儿一日活动的组织应()注重幼儿的实践活动,保证幼儿愉快的有益的自由活动
A.
重点突出
B.
分清轻重缓急
C.
动静交替
D.
合理安排
查看完整题目与答案
【单选题】The ____ of new scientific discoveries to industrial production methods usually makes jobs easier to do.
A.
addition
B.
association
C.
application
D.
affection
查看完整题目与答案
【简答题】A．They had lost their jobs as a result of the Industrial Revolution. B．They had been suffering from political and religious oppression. C．They wanted to flee from the widespread famine in Northern Eur...
查看完整题目与答案
【单选题】What is the environmental benefit of GM crops?
A.
Herbicidetolerant crops can reduce the use of chemicals.
B.
Herbicidetolerant crops can use milder chemicals.
C.
Bt genes can protect crops against insects instead of chemical pesticides.
D.
Insect-resistant crops only need a more benign mix of chemicals .
查看完整题目与答案
【简答题】What does the field grower of nursery crops purchase from some specialfirms for field plantings? _____________A. small plants started in plant bands B. slightlly larger ones in containers C. lining ou...
查看完整题目与答案