皮皮学，免费搜题
登录
搜题
【简答题】
一辆汽车的速度随时间的变化如图所示．请根据图象直接回答下列问题： （1）汽车在哪段时间内匀速前进？速度是多少？ （2）汽车在哪段时间内加速前进？ （3）汽车在20分钟到30分钟这段时间内速度是多少？ （4）汽车在第55分钟时的速度是多少？
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】______ the others he began to use foreign languages ______ a means to know the world.
A.
Like as
B.
For as
C.
As like
D.
As as
【单选题】Not until his mother came back_______.
A.
he began to do his homework
B.
had he began to do his homework
C.
he had begun to do his homework
D.
did he begin to do his homework
【简答题】He was told under no circumstances ______ the computer. A) he may use B) he use may C) may he use D) may use
【单选题】He stepped into the office ， down and began to fill in the forms ．
A.
． sitting
B.
． to sit
C.
． sat
D.
． having sat
【简答题】A．He began to use chemicals. B．He preserved food with sugar. C．He sealed food in jars. D．He kept food in cans.
【简答题】A．He began to use chemicals. B．He preserved food with sugar. C．He sealed food in jars. D．He kept food in cans.
【简答题】He began his career in 198
【简答题】He began to use bright colours in his paintings, especially the ______ and _______ for which he is known, after about ________.
【简答题】Only recently he began ______ (realize)that he was wrong.
相关题目：