当消防用电设备采用双电源供电时，应在( )配电箱处切换。 A

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问题多项选择题

当消防用电设备采用双电源供电时，应在( )配电箱处切换。

A．最上一级
B．最末一级
C．最中间一级
D．哪级都行

答案

参考答案：B

解析： GB50229—2006《火力发电厂与变电所设计防火规范》第8.1.6条。

填空题

选择括号内合适的词填空。

1. My aunt likes _____________ (dance / dancing) very much. She can dance _____________

(beautiful / beautifully).

2. There _____________ (isn't / aren't) any water in the glass.

3. Look! The farmers _____________ (milk / are milking) cows.

4. Su Hai and Su Yang are _____________ (twin sister / twin sisters).

5. Do more exercise. You'll get _____________ (strong / stronger).

6. He _____________ (is going to see / sees) a play tomorrow.

7. I didn't _____________ (ate / eat) a lot of delicious food last Spring Festival.

8. New Year's Day _____________ (come / comes) after Christmas. It's on the _____________

(first / one) of January.

问答题简答题

上海公园有百所以上，其中，部分公园已有近百年历史，不少树丛大树参天，下部植物密不透风，造成中、下层树木生长不良。根据公园有关技术养护标准，请你分析应采取何种措施才能使该公园中、下层树木恢复生长。