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【单选题】
A/D 转换器的功能是将 ( )A.
声音转换为模拟量
B.
模拟量转换为数字量
C.
数字量转换为模拟量
D.
数字量和模拟量混合处理
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反馈参考答案：
举一反三
【单选题】一定流量的液体在一φ33.5×3.25mm的直管内作湍流流动,其对流传热系数α=1000W/m 2 .°C。如流量与物性都不变,改用一φ19×2mm的直管,则其α值将变为________________W/m 2 .°C。
A.
1125
B.
1600
C.
2881
D.
889
【简答题】Please paraphrase the following sentence. (Para.19) That was the signal for a general rising all along the little valley.
【单选题】听力原文：M: Hi, Sally! It's been ages since we met last time. How are you getting along with everything? W: It's all right! And OK with you? M: Yeah, but you look a little upset today. Anything wrong? W: ...
A.
She hasn't seen her friend for years.
B.
She worries about her friend's health.
C.
She worries her daughter's health.
D.
She worries about her daughter's study
【单选题】一定流量的液体在一φ33.5×3.25mm的直管内作湍流流动,其对流传热系数α=1000W/m 2 .°C。如流量与物性都不变,改用一φ19×2mm的直管,则其α值将变为________________W/m 2 .°C。
A.
1125
B.
1600
C.
2881
D.
889
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