单项选择题

资产负债表和利润表的性质?

A．都是时点报表
B．都是时段报表
C．时段报表；时点报表
D．时点报表；时段报表

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不定项选择

数字触发器在某一时刻的输出状态，不仅取决于当时输入信号的状态，还与电路的原始状态有关。( )

A．错误
B．正确

Which of the following about a welcome speech are correct?
A、It is given by someone in order to welcome someone else into the company, party ,organization, etc.
B、It marks the start of any special event or occasion.
C、 It sets the mood of the function.
D、It is not an important speech.

答案： B,A,C