波前
参考答案:
波在介质中传播时,如果在某一时刻t,把空间中所有刚刚开始振动的点连成曲面,这个曲面就称为t时刻的波前面,简称波前.
根据课文内容填空(每小题0.5分, 满分8分)
The amber which was ________小题1: had a beautiful yellow-brown colour like honey. The ________小题2: of the room was in the ________小题3: style popular in those days. It was also a treasure ________小题4: with gold and jewels, which took the country's best artists about ten years to make.
As a ________小题5: of fact, every country wants the opportunity. It’s a great responsibility but also a great ________小题6:to be chosen. There’s as much competition among countries to _______小题7:the Olympics as to win Olympic medals.
Anyhow, my ________小题8: is to provide humans with a life of high ________小题9:. I am now truly filled with happiness that I am a ________小题10:friend and helper of the human race!
Wild plants and animals have to look after themselves. They need food, a good ________小题11:and________小题12:. If their habitat is threatened or they cannot find enough food, their numbers may __________小题13:.
However, after a year or so, in which they became more __________小题14:about their work, the Monkees started to play and sing their own songs like a real band. Then they ________小题15:their own records and started __________小题16:and playing their own music.
适用于"土壅木郁"证的治则是
A.抑强为主
B.扶弱为主
C.补母为主
D.泻子为主
E.以上都不是