X线最强波长与最短波长的关系是
A.λmax=0.5λ0
B.λmax=1.5λ0
C.λmax=2.0λ0
D.λmax=2.5λ0
E.λmax=3.5λ0
参考答案:B
---Which would you like better, tea or orange ? ---____. I prefer coffee _____ cream.
A.Either, to
B.Either, with
C.Neither, to
D.Neither, with
国家标准规定,接地线用()导线。
A.黄绿双色
B.黑色
C.红色
D.绿色