光缆障碍抢修,白天(8:00--20:00)时限为()小时,夜晚(20:00-8:00)()小时,不含海底光缆。
参考答案:4;6
When our teacher comes into the room. We greet him with __ “Good morning.”
A.a
B.the
C.an
D.one
铸造支架加强带应具有足够的强度,以克服应力作用而不产生变形或折断。其具体要求是()。
A.宽0.5~1.0mm,厚度≥0.3mm
B.宽0.5~1.0mm,厚度≥0.5mm
C.宽1.0~1.5mm,厚度≥0.5mm
D.宽1.5~2.0mm,厚度≥0.5mm
E.宽1.5~2.0mm,厚度≥0.7mm