皮皮学,免费搜题
登录
搜题
【单选题】
甲、质点在同一直线上做匀速直线运动,设向右为正方向,甲质点的速度为 2m/s, 乙质点的速度为 -4m/s, 则下列说法错误的是( )
A.
乙质点的速率大于甲质点的速率
B.
因为 +2 〉 -4 ,所以甲质点的速度大于乙质点的速度
C.
这里的正、负号的物理意义是表示质点运动的方向
D.
若甲、质点同时由同一点出发,则 10s 后甲、质点相距 60m
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
【判断题】一般当日平均气温连续3天或3天以上低于20℃时,就会对粳稻造成危害。
A.
正确
B.
错误
【单选题】对工业炉砌筑冬期施工的一般规定叙述错误的是( )。
A.
当室外日平均气温连续5d稳定低于5℃时,即进入冬期施工
B.
砌筑工业炉时,工作地点和砌体周围的温度,均不应低于10℃
C.
黏土、水玻璃和磷酸盐耐火浇注料的养护,应采用干热法
D.
水泥耐火浇注料的养护,可采用蓄热法或加热法
【简答题】第三部分:阅读理解(共15小题,每题2分,满分30分) 阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该项涂黑。 [AP Eeb.8] Costa Ricans have elected their first woman president as the ruling party candidate Laura Chinchilla won in an el...
【单选题】What can we learn about the company’s new “green” waste management program?
A.
The quality of waste management has become worse.
B.
The program is becoming more and more popular.
C.
Waste management has remained unchanged.
D.
More workers are involved in the program.
【单选题】What can be inferred about the executive management training session?
A.
It lasts for 4 days.
B.
It will be held at a hotel.
C.
It is required for all managers.
D.
It has been conducted twice before.
【单选题】1下列哪项不是细菌生长繁殖的基本条件
A.
充足的营养
B.
必需的气体
C.
适宜的温度
D.
合适的酸碱度
E.
充足的光线
【单选题】What can we learn about the company’s new “green” waste management program?
A.
The quality of waste management has become worse.
B.
The program is becoming more and more popular.
C.
More workers are involved in the program.
D.
Waste management has remained unchanged.
【单选题】工业炉冬期施工的一般规定中,当室外日平均气温连续( )d稳定低于5℃时,即进入冬期施工。
A.
3
B.
5
C.
7
D.
9
【判断题】隧道施工过程中,作业环境应达到氧含量、粉尘、瓦斯、有害气体、气温、噪声方面的标准。
A.
正确
B.
错误
【多选题】What can management research be divided into?
A.
e xploratory research
B.
descriptive research
C.
explanatory  research
D.
countermeasure research
相关题目: