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【简答题】
根据如图回答问题，与2号试管相连的电极接的是电源的______（填“正”或“负”）极．1号试管内的气体是______．1号试管与2号试管内气体体积之比为______．该实验说明______组成的．
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反馈参考答案：
举一反三
【简答题】ABB的标准I/O板提供的常用信号有哪些类型的信号?
【单选题】听力原文：M: What do you think of the director's annual report? W: I can hardly figure out what it is intended for. What is the woman's response?
A.
She doesn't know its intention.
B.
She can't understand the report.
C.
She doesn't think much of the report.
D.
She doesn't believe the exact figures in it.
【单选题】听力原文：W: Did you hear the weather report for today? W: The pollution's going to be so had they recommend staying indoors. Q: What are speakers discussing? (13)
A.
The weather yesterday.
B.
A polluted river.
C.
Hotel accommodations.
D.
The quality of the air.
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