管网阻力计算是从最不利环路开始的,即从环路最短的一根管道开始计算。
参考答案:错
单词拼写:根据下列句子及所给汉语注释,在答题卡上相应题号的横线上写出空缺处各单词的正确
形式。(每空只写一词)
1. We're taking our vacation in ______ (七月).
2. You can get even better deals if you are prepared to ______ (讨价还价).
3. The cards had been ______ (卡住) through the letterbox .
4. Smith went to Chicago for ______ (技术) training.
5. Bob is six feet in ______ (身高).
6. You'll ______ (逐渐) get better at it-it's just a question of practice.
7. He put the rubbish into the ______ (塑料) bag and took it downstairs.
8. He ______ (道歉)) publicly for his mistake the day before yesterday.
9. Tall people like rooms with high ______ (天花板).
10. Eve was cutting the grass, and ______ (同时) Les was planting roses.
在影响消费者行为的不同参照群体中,家庭成员、亲朋好友、同事等属于消费者的()。
A.首要群体
B.次要群体
C.向往群体
D.厌恶群体