按法用力宜由轻到重，按压动作需平稳而有节奏。
参考答案：对
Look，read and answer. (看图，读句子回答问题)
1. Did you play football yesterday?
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2. Did you go hiking last weekend?
3. Did you visit your grandparents last Sunday?
低压带电工作时，断开导线应先断开（）
A、相线
B、零线
C、中性零线
D、相线与零线
