
作用在刚体上的两个力的平衡充要条件是这两个力大小____、方向____、作用在____ 。


Fill in the blanks of the following incompleted sentences with the words given below, change the forms where necessary.
artificially cute expansion innocent morality originally proponent resource safeguard threat unstoppable upheaval
1.All the evidence that the police could find has proved the young man ________ of the crime.
2.Some families don’t have the financial( 金 融 的 )_________ to provide their children with proper education.
3.Every country has the right to protect itself against the ________ from other countries.
4.If it is carried out, this new policy(政策) is likely to cause social _________.
5.It would be a pity if rich people are more respected than people of high ________ in a society.
6.To my pleasant surprise, the old building looks the same as it did _________.
7.The development of AI has given this IT company a great opportunity for further
_________.
8.Here’s a really ______ picture of Harry and his three lovely kids.
9.Sally is a strong _________ for animal rights. She refuses to use animals in experiments.
10.These diamonds(钻石) are _________ made, which is why they are so cheap.
11.Even a child knows that warm clothes help to ______ a person against catching cold.
12.The king was sure that his __________ armies would defeat all of his enemies.