黄光的频率范围约在5.0×1014～5.2×1014Hz之间，它在空气中的波长范

Louis Armp had two famous nicknames. Some people called him Bagamo. They said his mouth looked like a large bag. Musicians often called him Pops, as a sign of respect for his influence on the world of music.
Born in 1901 in New Orleans, he grew up poor, but lived among great musicians. Jazz had been invented in the city a few years before his birth. Armp often said, "Jazz and I grew up together. "
Armp showed a great talent for music when he was taught to play the comet at a boy’s home. In his late teens, Armp began to live the life of a musician. He played in parades, clubs, and on the steamboats that traveled on the Mississippi River. At that time, New Orleans was famous for the new music of jazz and was home to many great musicians. Armp learned from the older musicians and soon became respected as their equal.
In 1922 he went to Chicago. There, the tale of Louis Armp began. From then until the end of his life, -Armp was celebrated and loved wherever he went. Armp had no equal when it came to playing the American popular song.
His cornet playing had a deep humanity and warmth that caused many listeners to say, "Listening to Pops just makes you feel good all over. " He was the father of the jazz style and also one of the best known and most admired people in the world. His death, on July 6th 1971, was headline news around the world.

Which would be the best title for the text

A. The Invention of the Jazz Music
B. The Father of the Jazz Style
C. The Making of a Musician
D. The Spread of Popular Music

患者女，6岁。体检时发现胸骨左缘第二肋间3/6级连续机械样杂音，平时一般体力活动无不适。

首选检查是（）。

A.X线胸片

B.心电图

C.超声心动图

D.心血流血池显像

E.冠脉CT

—Don’t forget _________my English book to school tomorrow.

—OK, I won’t.

A．getting

B．to get

C．bringing

D．to bring

如图所示，光滑水平面上放置质量分别为m和2m的四个木块，其中两个质量为m的木块间用一不可伸长的轻绳相连，木块间的最大静摩擦力是μmg。现用水平拉力F拉其中一个质量为2m的木块，使四个木块以同一加速度运动。则轻绳对m的最大拉力为

A．

B．

C．

D．

简述本装置中SRT－II型炉的清焦过程。