通常，在燃气轮机的启动过程中，由于供油量配合不当，机组就很容易进入喘振工况而使启动失败，此即所谓（）。
参考答案：热挂现象
声纹锁是一种新型的锁，只要主人说出事先设定好的暗语就能把锁打开，外人即便说出暗语也无法打开，这种声纹锁辨别声音的上要依据是：
A．音调
B．响度
C．音色
D．声速
根据句意及首字母提示补全单词。
1. I'm going to Hawaii for v______ , and I'll stay there for two weeks.
2. There are a lot of t______ in Thailand every year.
3. when you v______ London, one of the first things you will possibly see is the Big Ben.
4. I will be b______ to school next Friday.
5. He is not watching TV. He is r______ videos now.
