皮皮学，免费搜题
登录
搜题
【单选题】
在平直公路上，自行车与同方向行驶的一辆汽车在t=0时同时经过某一个路标，它们的位移随时间变化的规律为：汽车x=10t-t2，自行车x=5t，（x的单位为m，则下列说法正确的是t的单位为s）（）A.
汽车做匀加速直线运动，自行车做匀速直线运动
B.
经过路标后的较短时间内自行车在前，汽车在后
C.
在t=2.5s时，自行车和汽车相距最远
D.
当两者再次同时经过同一位置时，它们距路标12.5m
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】听力原文：M: You look so worried, Dorothy. What's on your mind? W: I'm worried about meeting Mr. Stone tomorrow. It's so important to me. You know, I've been looking for a job for three months. What will t...
A.
Get an important job.
B.
See someone for a job.
C.
Attend a meeting.
【单选题】____ the flight to Beijing will be delayed is ____ I’m especially worried about.
A.
If; what
B.
Whether; that
C.
When; that
D.
Whether; what
【单选题】听力原文：M: I have an elderly mother and I'm worried about her going on a plane. Is there any risk? W: Not if her heart is all right. If she has a heart condition, I'd recommend against it. Q: What does t...
A.
When she will return home.
B.
Whether she can go by herself.
C.
Whether she can travel by air.
D.
When she will completely recover.
【单选题】听力原文：M: I'm worried about those classes I missed when I was sick. W: I will try to bring you up today on what we've done. Q: What does the woman mean? (15)
A.
She will help the man to catch up.
B.
She is worried about the man's health.
C.
She will take the man to the hospital.
D.
She has bought the man a pair of glasses today.
【单选题】_________ the flight to New York will be delayed is _________ I’m especially worried about.
A.
If; what
B.
Whether; that
C.
When; that
D.
Whether; what
【单选题】听力原文：M: I'm worried about those classes I missed when I was sick. W: I will try to bring you up today on what we've done. Q: What does the woman mean? (10)
A.
She will help the man to catch up.
B.
She is worried about the man's health.
C.
She will take the man to the hospital.
D.
She has bought the man a pair of glasses today.
相关题目：