问题
单项选择题
下面所列绝缘子的安全系数有误的是( )。
A．套管、支持绝缘子：荷载长期作用时为2.5，荷载短期作用时为1.67；
B．悬式绝缘子：荷载长期作用时为4，荷载短期作用时为2.5；
C．套管、支持绝缘子的金具：荷载长期作用时为4，荷载短期作用时为2.5；
D．悬式绝缘子的金具：荷载长期作用时为4，荷载短期作用时为2.5。
答案
参考答案：C
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下面所列绝缘子的安全系数有误的是( )。
A．套管、支持绝缘子：荷载长期作用时为2.5，荷载短期作用时为1.67；
B．悬式绝缘子：荷载长期作用时为4，荷载短期作用时为2.5；
C．套管、支持绝缘子的金具：荷载长期作用时为4，荷载短期作用时为2.5；
D．悬式绝缘子的金具：荷载长期作用时为4，荷载短期作用时为2.5。
参考答案：C
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| My pen friend is a kind and friendly girl. She is in England. Her _1_ is Connie. I meet Connie _2_ the Internet, and we are both twelve years _3_ . First, I _4_ a letter to her and introduce my hobbies, my school and my daily life. A few days later, I receive Connie's _5_ . She _6_ me a lot about herself. I learn that she loves languages, sports and movies. She likes China and Chinese food very much. She tells me something about England, too. Connie is good at English, French(法语)and Spanish(西班牙语), so I ask her to _7_ me a little of them. Connie wants to learn some _8_ , but it's very difficult for her. Through Connie, I know _9_ about the world outside. I would like to 10_ Connie some day in England.
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