【简答题】When delivering a speech, you have to speak clearly and slowly to make yourself (understand)______.
【单选题】When delivering an address, the most important listener-related factor is usually ()
D.
Channel of communication.
【单选题】Eye_______ is very important when delivering a speech in public.
【简答题】When a female whale is delivering a baby, another female usually comes to help as a ______.
【简答题】n越大,对随机过程统计特性特性的描述越 。
【判断题】活塞式输油泵的输油量取决于活塞的行程,当活塞行程等于偏心轮的偏心距时,输油量最大。