架空光缆与市内胡同平行时最低路线到地面的距离为（）。
A.3.5M
B.4.0M
C.4.5M
D.5.0M
参考答案：B
胺类捕收剂有哪些特点？
Many pregnant women have bought this kind of clothes to ________ radiation.
A．block
B．protect
C．distinguish
D．guarantee
