问题
单项选择题
在直接接地系统中，当接地电流大于1000A时，变电站中的接地网的接地电阻不应大于（）。
A、5Ω；
B、2Ω；
C、0.5Ω；
D、4Ω。
答案
参考答案：C
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在直接接地系统中，当接地电流大于1000A时，变电站中的接地网的接地电阻不应大于（）。
A、5Ω；
B、2Ω；
C、0.5Ω；
D、4Ω。
参考答案：C
On Friday morning, I was waiting in the corridor with my class for the physics exam. Glancing back from the front of the queue, I found my best friend Terry, who was treating me like I didn’t exist during the past two weeks, 36 all my calls and messages. With all the students seated in the exam room, Mr. Reed, our physics teacher, talked to the class and announced the exam. I hated physics and felt it hard to 37 my paper. I was just looking up when a 38 caught my eye. I could hardly believe it! Terry had her phone on her left knee and she was reading from it. Is that how Terry always got good 39 ? I almost put my hand up to tell the teacher, but what would everyone else think of her? However, it wasn’t 40 ! So I nodded to Mr. Reed. He walked 41 down the row of tables. Terry was busy with her phone so that she didn’t even find Mr. Reed had 42 her. She looked up from her phone with a frightened expression. Before she had a chance to explain, Mr. Reed took her 43 and told her to leave the room. Terry started crying as she walked to the door, looking back over her shoulder at me, sad and ashamed. After the exam, I received a text message from Terry, saying “I’m really 44 that I’ve been avoiding you lately but it’s been the hardest two weeks of my life. My dad has a heart attack and he’s been in hospital. He has a(n) 45 today and I am really worried. I know it is stupid, but I was trying to send a text message to my mum to see how it was going. Then Mr. Reed caught me and thought I was 46 . I wish I’d told you what’s been happening. I know I shouldn’t 47 who my friends are. Will you forgive me?” At these words, from my deep heart sprang up a burst of guilt along with the belief: Friendship is an honor and a gift, and worth the effort to treasure.
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