一质点做简谐运动时,其振动图象如图。由图可知,在t1和t2时刻,质点运动的
A.位移相同
B.回复力相同
C.速度相同
D.加速度相同
答案:C
看图,根据对话打“√”或“×”判断对错。
Liu: Excuse me. Where is the Zhong bai Supermarket, please?
Policeman: It's west of the hospital.
Liu: Is it far from here?
Policeman: Yes.
Liu: How can I get there?
Policeman: First, turn left and take the No. 16 bus at the bus stop. Next, get off at the hospital. Then, cross
(穿过) the street. You'll be in front of the Supermarket.
Liu: Thank you.
Policeman: You're welcome.
( ) 1. The post office is next to the supermarket.
( ) 2. The supermarket is west of the hospital.
( ) 3. Liu Yun goes to the supermarket on foot.
( ) 4. Liu Yun asks a policeman for help.
以轴类零件为例的坐标式尺寸标注是指轴向尺寸标注,以()为基准,分层注写。
A.端面
B.一边端面
C.两边端面
D.任意端面