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【单选题】
电桥RC正弦波振荡电路如图所示。设A为理想集成运放，电阻R1＝10kW，R2＝2kW，Rf＝5kW，现要求稳定振荡时输出电压峰值Uom＝8V。忽略稳压管正向导通压降，则稳压管VDZ的稳压值UZ为（ ）V。【图片】A.
2
B.
3
C.
4
D.
5
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】下列表述中不属于营运资金的特点是( )。
A.
企业筹集营运资金的方式一般比较少
B.
营运资金一般具有较强的变现能力
C.
企业营运资金的实物形态是经常变化的
D.
企业占用在流动资产上的资金周转一次所需时间较短
【简答题】楼梯踏步宽度不宜低于( )mm。
【多选题】对于汉语音节、因素概念的正确描述为
A.
音节是语音中的自然单位，一个汉字就是一个音节。
B.
音节是语音的最小单位 , 它是从音节中分析出来的更细小的成分。
C.
音素是发声的元素。
D.
音节语音的最小单位，一个方块字就是一个音节。
【单选题】W： Ray, aren’t you going straight home after school today? M：___________
A.
Yes, I won't be going home until Friday.
B.
No. I have a class until one o’clock, and after that I'm going to spend a couple of hours at the library before going home.
C.
Yes. But I am afraid I have to stay for a few hours in the city library before going home, home directly.
D.
Yes. If I were you, I wouldn' t go
【单选题】于对元音的概念描述正确的是——
A.
元音 发音时声带不振动。
B.
元音发音时气流在口腔内有阻碍。
C.
元音发音时发音器官张开，满口用力。
D.
语音学中元音不可自成音节。
【单选题】对于元音的概念，描述正确的是
A.
语音学中元音发音时声带不振动。
B.
元音发音时气流在口腔内有阻碍。
C.
元音发音时发音器官张开，满口用力。
D.
语音学中元音不可自成音节。
【简答题】患者女，25岁，因“食欲减退，多饮，烦渴，多尿15 d”来诊。1型糖尿病病史。查体：身高160 cm，体重41 kg；皮肤弹性差，呼吸深大，面色潮红，意识模糊。实验室检查：空腹血糖22.2 mmol/L；尿糖（+++），尿酮体（++++）。为明确诊断，应立即进行的检查项目包括A、心电图 B、血离子测定 C、血分析 D、胸部X线片 E、肾功能测定 F、血脂分析 G、肝功能测定 最可能的诊断是A、乳酸...
【单选题】A: Ray, aren't you going straight home after school today? B: ______.
A.
Yes, I won't be going home until Friday.
B.
No. I have a class until 1 o'clock, and after that I'm going to spend a couple of hours at the library before going home.
C.
Yes. But I am afraid I have to stay for a few hours in the city library before going home.
D.
Yes. If I were you, I wouldn't go home directly.
【单选题】W: Ray, aren't you going straight home after school today? M: ________
A.
Yes, I won't be going home until Friday.
B.
No. I have a class until one o'clock, and after that I'm going to spend a couple of hours at the library before going home.
C.
Yes. But I am afraid I have to stay for a few hours in the city library before going home.
D.
Yes. If I were you, I wouldn't go home directly.
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