利用示波器可显示发动机点火过程的四类波:()、()、()、()。
参考答案:多缸平列波;多缸重叠波;多缸并列波;单缸标准波
阅读,并判断正误,正确的写“A”,错误的写“B”。
( )1. Nick's tennis racket is white.
( )2. Tony lost his ID card.
( )3. The phone number of Lisa is 15674328907.
( )4. If you lose (丢失) a ring, you can call Bill.
( )5. If (如果) you find a set of keys, you can call Lucy. Her telephone number is 13678954320.
仅腹部膨隆而四肢消瘦,多属______;腹大而周身俱肿,多属______。