题目内容

下列说法不正确的是______。

A. 同步时序电路中,所有触发器状态的变化都是同时发生的
B. 异步时序电路的响应速度与同步时序电路的响应速度完全相同
C. 异步时序电路的响应速度比同步时序电路的响应速度慢
D. 异步时序电路中,触发器状态的变化不是同时发生的

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时序逻辑电路的输出状态不仅与前一刻电路的输出状态有关,还与电路当前的输入变量组合有关。

A. 对
B. 错

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在桥式整流电容滤波电路中，已知变压器副边电压有效值U2为20V，RC>3T/2（T为电网电压的周期）。测得输出电压平均值UO可能的数值分别为多少？请选择合适答案填入空内。(1) 正常情况UO≈； (2) 电容虚焊时UO≈；(3) 负载电阻开路时UO≈； (4) 一只整流管和滤波电容同时开路，UO≈。

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What is the man planning to do according to the conversation?

A. Enter the stock market instead of investing in clothing
B. Move to another residence from Wall Street.
C. Transfer his investment to the Chinese stock market.
D. Share his money-making experience with other marketers.

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What does the man mean to do according to the conversation?

A. Sign his name for the fan.
B. Fill in an application form.
C. Exchange gifts with his friends.
D. Get a purchase refunded.

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