从外界到达肺部的“旅程”顺序正确的是()
A:鼻→咽→喉→气管→支气管→肺
B:口腔→喉→咽→气管→支气管→肺
C:鼻→气管→咽→喉→支气管→肺
D:口腔→咽→喉→支气管→气管→肺
若有理数x、y满足|x|=7,|y|=4,且|x+y|=x+y,求x﹣y的值.
This big coat is . That is yours.