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未知题型

酸性水产自汽油、柴油装置（）

A.正确
B．错误

【参考答案】

B．错误汽油和柴油装置产生的酸性水通常是指含有硫化氢、有机酸等酸性物质的废水。这些酸性物质主要来源于原油中的硫化物和其他......

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单项选择题

清洁地板的步骤（）

A.扫拖推倒
B．扫推拖倒
C．推扫拖倒
D．推拖扫倒

单项选择题

Paragraph 1 Valerie opened up the letter from the military department. She felt the pit of her stomach drop to the bottom of the earth before she even opened it. She knew it was news about John. As she read the first line, she thought of all the lunches she had packed him and all the nights she tucked him in his bed and warded off the nighttime monsters. The man carrying the flag put his hand on her shoulder. She thought of the day that John signed up for the military. Her tears wet the letter. She stopped reading after the first line. Question: What might the letter most likely say?
A、John joined the enemy forces.
B、John had been promoted.
C、John was on his way home.
D、John was killed in combat.

未知题型

不同电压的插座应有明的区别，不能互用（）

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