【简答题】变比n=10的变压器,原绕组接上E=10V的直流电源,副绕组两端电压为______________,原绕组接上E=10V的交流电源,副绕组两端电压为______________V,如果负载电阻RL=2Ω,那么原边的等效电阻为______________Ω。
【简答题】变比n=10的变压器,原绕组接上E=10V的直流电源,副绕组两端电压为______
【单选题】降雨以时段降水量、()、日降水量、天气状况、旬降水量、月降水量的顺序列报。
【单选题】刚体受两个力作用而平衡的充分与必要条件是此二力等值、反向、共线。这是()
【判断题】平板式直齿圆柱齿轮的画法,轮齿部分应按照规定画法,而其它部分可按照投影画法。
【单选题】如果患者同意安置埋藏式心脏起搏器,对患者最有利的起搏器是
【判断题】“机会主义者就是看机会而采取行动的人。”作为概念是否正确?()
【单选题】Which of the following statement is not correct?
A.
When pitch, stress and sound length are tied to the sentence rather than the word in isolation, they are collectively known as intonation.
B.
Chinese is an intonation language.
C.
Stress includes changes in pitch, volume, syllable length, and vowel clarity.
D.
The major four tones in English are falling tone, rising tone, fall-rise and rise-fall
【多选题】when ____,_____and ______are tied to the sentence rather than the word in isolation, they are collectively known as intonation.