Fill in the blanks with how much/how many . 1. pairs of jeans do you want? 2. is a new pair of shoes? 3. are his pants? 4. shirts does she have? 5. does his sweater cost?
【单选题】The eccentric mass and amplitude will be changed, depending on the direction of rotation of the eccentric shaft. High frequecy is connected with _______ amplitude, low frequency with a ______ amplitit...