使两个构件直接接触并能产生相对运动的联接称为运动副。 ( )
查看答案
When we meet a person for the first time we say: _____.
A. Pleased
B. Nice to meet you
C. Enchanted
If someone says "Thank you", you say: "You're _____."
A. welcome
B. well
C. nothing
When you want to get someone's attention you can say: _____.
A. Excuse me
B. Stop
C. Sorry
At 9 o'clock a.m., you say: _____.
A. Good evening
B. Good afternoon
C. Good morning