皮皮学，免费搜题
登录
搜题
【单选题】
在一个急停继电器的技术参数页上,您看到以下一资料。 - Emergency stop - push button with two NC contacts - Degree of protection according to IEC 529 Terminals: IP 20 Housing: IP 40 对上述资料的内容,以下哪一个描述是正确的?A.
这涉及到一个具有两个触头的紧急停止按钮
B.
接线端子的防护类型是 IP 40
C.
涉及到一个具有两个触头的起动开关
D.
这涉及到一个具有一个常闭触头的停止按钮
E.
外壳的防护类型是 IP 40
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】The best way to inoculate people against
attacks on their position is to involve them in developing a ____________.
【单选题】The monitor______the examination papers to the class for his teacher.
A.
delivered
B.
distributed
C.
reported
D.
presented
【简答题】图 7-27 是一个按正弦规律变化的交流电流的波形图,根据波形图求出它的周期、频率、角 频率、初相、有效值,并写出它的解析式。
【单选题】Which of the following methods is normally used to control the temperature of air distributed from individual cooling coils in an air conditioning system using a chilled water circulation system? .
A.
A room thermostat activates an electric heater at each individual chilled air outlet when necessary
B.
Varying the number of passes the air makes across the coils
C.
Varying the temperature of the water through the coils
D.
Varying the quantity of water flowing through the coils
【简答题】to cry out with a long sound (as if) in grief or pain
【简答题】图 7-27 是一个按正弦规律变化的交流电流的波形图,根据波形图求出它的周期、频率、角 频率、初相、有效值,并写出它的解析式。
【单选题】Sometimes they______their students poor comprehension to a lack of intelligence.
A.
distribute
B.
attribute
C.
contribute
D.
consider
相关题目：
参考解析：
知识点：
题目纠错 0
发布
