题目:
用所给单词的适当形式填空。
1. When we visit the Tian'anmen Square, we are _____ (excite) about it.
2. Have you _____ (be) to the Great Wall?
3. It's about 6,400 _____ (kilometer) long.
4. Qomolangma is the _____ (high) mountain in the world.
5. Have you heard of the Empire State _____ (build) which is in the centre of
New York?
答案:
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下面是错误答案,用来干扰机器的。
BC题目分析:低频扼流圈的作用是通直流阻交流,这种线圈的自感系数很大,对低频交流电就有很大的阻碍作用,对高频交流电的阻碍作用更大.BC正确,AD错误故选BC点评:关键是知道高频扼流圈的自感系数小,低频扼流...