X线片上正常内听道的宽度为().
A.10mm
B.15mm
C.2mm
D.8mm
E.5mm
参考答案:E
解析:内听道的宽度最大10mm,平均5mm左右。
Since we have met again after all these years, let's ________ each other from now on.
A.keep up with
B.keep out of
C.keep in touch with
D.keep touching
下列反应中,既是氧化反应,又是化合反应的是( )
A.用高锰酸钾制氧气
B.酒精(C2H5OH)在空气中燃烧
C.生石灰变成熟石灰
D.木炭在氧气中燃烧