皮皮学，免费搜题
登录
搜题
【多选题】
关于环状阀叙述正确的是( )。A.
环状阀的特点是结构简单，制造容易，安装方便，工作可靠。
B.
改变阀片环数，能改变排气量，而不受压力和转速的限制。
C.
由于阀片是分开的，各弹簧的弹力不一致，阀片启就不易同步、及时和迅速，从而降低气体流量，影响压缩机的工作效率。
D.
阀片的缓冲作用较差，冲击力大 ; 弹簧在阀片上只有几个作用点，使阀片在气体作用力下产生附加弯曲应力，这都将加快阀片和凸台的磨损。
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
【简答题】任何复杂的汽车电路其原理都基本相同 , 都是由两个 和 组成。
【简答题】任何复杂的汽车电路，其原理都基本相同，都由（）和（）组成。
【简答题】任何复杂的汽车电路其原理都基本相同 , 都是由 和 组成
【单选题】In each inflatable rescue boat, what piece of equipment is provided to make quick, emergency, temporary repairs to a large hole in a raft?______.
A.
No equipment is provided
B.
Self-adhesive rubberized canvas patches
C.
Glue and rubber patches.
D.
Several various-sized sealing clamps
【判断题】A topic is provided to students about what you have to perform the discussion and this is a topic-based group discussion.
A.
正确
B.
错误
【单选题】According to the advertisement, what is provided on the Web site?
A.
A coupon code
B.
A critic's review
C.
A list of features
D.
A free trial version
【单选题】What is provided to employees?
A.
Names of hotels
B.
Facilities at banks
C.
Personnel changes
D.
Employee benefit schemes
【单选题】What is provided to alternators since current protection cannot be used?
A.
Reverse power protection
B.
Current protection
C.
Power protection
D.
Voltage protection
【单选题】In each inflatable liferaft，what equipment is provided to make quick，emergency，temporary repairs to large holes in the raft? （）
A.
No equipment is provided
B.
Glue and rubber patches
C.
Several various-sized sealing clamps
D.
Self-adhesive rubberized canvas patches
相关题目：
参考解析：
知识点：
题目纠错 0
发布
