全塑电缆屏蔽层连通电阻主干电缆是（）。
A、≤2.6Ω/km
B、≤5.0Ω/km
C、≤3Ω/km
参考答案：A
Christmas is a holiday usually celebrated on December 25th _____ the birth of Jesus Christ. [ ]
A. in charge of
B. in terms of
C. in favor of
D. in honour of
第9胸椎棘突下旁开1.5寸的腧穴是
A．肝俞
B．心俞
C．脾俞
D．肺俞
E．肾俞
