【单选题】Question 4. Why did man in the 1960s develop a desire to explore again? ----- Passage 1 ----- There are many great inventions that have changed the way we live in. The first great invention was one th...
A.
Man wanted to move to other stars.
B.
Other countries wanted to catch up with the United States.
【简答题】An ABS controls wheel lock-up by ( 1 ) A 3 unit force is exerted on a cylinder. What force is exerted on the salve cylinder if its area is 4 times that of the cylinder? ( 2 ) 0 简单液压制动(盘式...