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碳酸钠晶体的化学式为______．在常温下碳酸钠晶体在干燥空气中能逐渐失去______而成为白色粉末，这种现象叫做______．
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【简答题】男性，18岁，上呼吸道感染后2天出现血尿，尿常规蛋白阴性、尿红细胞满视野。提问：首先考虑的诊断是A、急性肾小球肾炎 B、IgA肾病 C、急进性肾小球肾炎 D、尿路感染 E、尿路结石 F、慢性肾炎急性发作 提示：入院后检查扁桃体Ⅱ度肿大。提问：尿检主要表现为A、大量的均-红细胞 B、大量的红细胞，白细胞 C、大量的红细胞伴血凝块 D、大量的红细胞，变形红细胞>70％ E、大量的红细胞白细胞及上皮细胞...
【多选题】Microwave engineering pertains to the study and design of microwave circuits, components, and systems. Fundamental principles are applied to analysis, design and measurement techniques in this field. ...
A.
Design of microwave circuits, components, and systems. 【设计微波电路、元件及系统】
B.
Fundamental principles are applied to analysis, design and measurement techniques in this field. 【微波原理、应用、测试技术等】
C.
低频电子线路（ low frequency Electronic Circuit)
D.
antennas , radar , transmission lines , space based systems ( remote sensing ), measurements, microwave radiation hazards and safety measures. 【天线、雷达、传输线、遥感/遥测 等】
【简答题】问讯处
【简答题】Spread spectrum simply means that data is sent in small pieces over a number of the ( ) (A.continuous B.high C.low D.discrete ) frequencies available for use at any time in the specified range. Devi...
【单选题】What is the central idea of the declaration of independence
A.
The declaration of American independence
B.
The abolition of slavery in the United States
C.
The formal promulgation of the constitution
D.
The election produced the thirteenth president of the United States
【单选题】What is the central point of this passage?
A.
The importance of symmetry in Eastern art.
B.
The need to generate muscular tension.
C.
The importance of visual distraction.
D.
The principle of symmetry.
【单选题】In the design of a radio receiver containing a type 3 filter, a low capacitance level and a high inductance level would be most useful for the purpose of:
A.
enhancing radio reception across the frequency spectrum.
B.
tuning out signals at high and low frequencies.
C.
tuning in a radio station at a fixed frequency.
D.
minimizing unwanted audio noise at middle frequencies.
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