【单选题】【消耗次数：1】
谐振频率可以是流量脉动频率的2倍、3倍或更大。该说法（ ）
①
正确
②
错误
参考答案：
复制
纠错
相关题目
【单选题】
对于风向频率玫瑰图说法错误的是（ ）。
①
它是根据某一地区全年平均统计的各个方向顺风次数的百分数值，按一定比例绘制
②
实线表示全年风向频率
③
虚线表示夏季风向频率
④
图上所表示的风的吹向是指从外面吹向该地区中心，且画在总平面上
【判断题】
为减少机械传动部件的扭矩反馈对电机动态性能的影响，机械传动系统的基本固有频率应低于电气驱动部件的固有频率的2~3倍，同时，传动系统的固有频率应接近控制系统的工作频率，以免系统产生振荡而失去稳定性。
①
正确
②
错误
随机题目
【简答题】
Direction: Fill in the blanks with the words given below. Change the form if necessary.[hug; flatten; ancestor; amazing; solemnly; comfort; awful; desperately; uproot; cousin]7. Extending your tongue helps[填空1]the back of your tongue.
【简答题】
Translate the following sentence into English.多亏了一系列的新发明,现在的医生能够成功地治疗这种疾病了。
【简答题】
Translate the following sentence into ChinesePeople gain fortunes not only by hard labor but also by honesty.
【简答题】
Translate the following sentence into English.他没有努力学习功课，否则的话，他可以通过考试。
【简答题】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[sell out; in other words; consist of; stand for; rely on; demand for; engage in; at hand; yield to; confront with]10. Id just like to move to a neighborhood where I wouldnt have to see all the problemsIam[填空1]every day.
【简答题】
Direction: Fill in the blanks with the words given below. Change the form if necessary.[expand; abuse; knowledge; narrative; plantation; property; oppressive; extremely; rebel; abolitionist]4. Tell someone (particularly children) to do the opposite of what you really want, and they will[填空1]and actually end up doing what you want.
【简答题】
Direction: Fill in the blanks with the phrases given below. Change the form if necessary.[collide with; take hold of; for a moment; head for; ever since; be full of; share with; make fun of]6. We saw him[填空1]us, so we stepped aside.
【简答题】
<img src="https://huaweicloudobs.ahjxjy.cn/E5F6AEB6B05D2A517816B38FEA9CEE81.png" title="2.png" alt="2.png"/>
【简答题】
<img src="https://huaweicloudobs.ahjxjy.cn/AE6FDED453ABE6EF485D55EACD6A5CED.png" title="5.png" alt="5.png"/>=[填空1]
【简答题】
Translate the following sentence into English.在他开始欧洲之行之前，我们希望他旅途愉快。