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奇普里安·波隆贝斯库(1853年 - 1883年)是罗马尼亚浪漫主义最重要的作曲家之一,其主要作品包括《巴拉达》和《新月》,以民族主义和抒情性为特征。

在本课中,你将了解弓弦乐器。你会聆听它们的声音,认识它们的组成部分,并通过实验了解弦的振动是如何产生音乐的。

音乐无需语言即可传达情感,并帮助你识别、命名和表达自己的感受。

A lecke a nagy Fermat-sejtés lényegét, történeti hátterét és az n = 3 esetre vonatkozó indirekt bizonyítás alapgondolatát foglalja össze.

A tananyag animációk segítségével szemlélteti a másodfokú egyenletek geometriai megoldásait, a „görög” gondolkodásmódot követve a matematika tanításában.

本課程可幫助您瞭解聽覺的產生過程。

“在家自學”系列電子課程的用户手冊。

鹵素和金屬結合產生溴化物。

I bet you cannot blow my paper bridge away.

I bet you are not strong enough to blow the table tennis ball out of the funnel.

I bet I can inflate a garbage bag faster than you.

I bet I can inflate a balloon inside a plastic bottle.

I bet I can look into a blown-up balloon without deflating it.

I bet I can shrink an inflated balloon without letting air escape from it or even touching it.

節約能源是每個人的任務,因為地球人口很快會超過地球的承受極限。

I bet I can break a wooden skewer with one chop, even though only a few sheets of paper covers the part that is on the table.

I bet I can make a musical sound using a matchbox.

I bet if I cover a water-filled glass with a sheet of paper and I turn it upside down, water will not spill out.

I bet I can pierce an inflated balloon without bursting it by pushing a skewer right through it.

I bet I can send a bag airborne without throwing it upward.

I bet I can make a gun using a plastic tube and raw food materials.

I bet I can crush a plastic bottle with the help of a few litres of water.

I bet I can make a turbine using 3 straws.

I bet I can suck up your drink from your glass with this plastic bottle without squeezing it.