
高压及超高压管道及其附件的连接方法是焊接连接。
A . 正确
B . 错误


A . 正确
B . 错误
Complete the sentences with the expressions below. Change the form when necessary.
stable distinct lack complex unique transition eventual
1. The program focuses on first-year students and their ____________ from high school to college.
2. Without a(n) _________ financial support, he had to take several part-time jobs to keep himself going through the college years.
3. It is said that Mary is good at English because of her _________ learning style.
4. The twins went to the same department, which, however, confused no one, because they were clearly ____________ from each other in appearance.
5. Li Mei had never thought she would be the ____________ winner of the English-speaking contest.
6. Some college students ______ basic English writing skills.
7. The experiment is so ____________ that many students find it difficult to make.