皮皮学，免费搜题
登录
搜题
【判断题】
作功冲程将近终了时,排气门打开,进气门仍然关闭。活塞油曲轴带动,从下止点向上止点移动,废气在自身压力和活塞的挤压下,被排出气缸。当活塞到达上止点时排气冲程结束,但在燃烧室中仍然残留少量废气无法排除,称为做功冲程( )A.
正确
B.
错误
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【判断题】A study of packaging’s changing roles and forms over the centuries is really a study of the growth of civilization.
A.
正确
B.
错误
【简答题】以下程序段的输出结果是 。intx=2;do{printf("*");x--;}while(x);
【简答题】试述声波传入及产生听觉的途径(空气传导)。
【单选题】The Poison Prevention Packaging Act considered the safety of several special product packaging in 1970, such as mainly .
A.
radioactive and dangerous chemicals packaging.
B.
food and medical product packaging.
C.
industrial retail packaging.
D.
sanitary articles.
【简答题】试述声波的空气传导途径。
【单选题】Packaging It is said that the public and Congressional concern about deceptive packaging rumpus started because Senator Hart discovered that the boxes of cereals consumed by him, Mrs. Hart. and their ...
A.
this entails an increase in the cost of packaging
B.
they have to pay for the cost of changing package sizes
C.
the unit price for a product often rises as a result
D.
they hate to see any changes in things they 'are familiar with
【单选题】Which kind of packaging is directly contact with the contents?
A.
primary packaging
B.
secondary packaging
C.
transit packaging
D.
tertiary packaging
相关题目：
参考解析：
知识点：
题目纠错 0
发布
