通常用量筒直接测量的物理量是( )
A:固体的体积
B:固体的质量
C:液体的体积
D:液体的质量
营造鸟巢对鸟的生殖有什么作用?
直线l的倾斜角为α,且sinα=35,则直线l的斜率是( )
根据文章意思,正确排序。
①Yes, we have a new music teacher.
②Do you like her?
③Is she old?
④Do you have new teachers?
⑤ No, she isn’t. She is funny.
⑥Yes, we all like her.
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如图,某游乐场一山顶滑梯的高为h,滑梯的坡角为α,那么滑梯长l为( )