皮皮学，免费搜题
登录
搜题
【多选题】
下列描述安全阀工作原理的说法正确的是（）。A.
安全阀通常受弹簧作用或导阀控制
B.
安全阀有杠杆式和弹簧式等类型
C.
当入口处静压超过设定压力时，阀瓣上升以泄放被保护系统的超压
D.
当压力将至压力时，则自动关闭
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
【简答题】请根据你的了解 , 叙述 C++ 的特点。 C++ 对 C 有哪些发展 ?
【简答题】80C51单片机可扩展 位外部地址总线。
【单选题】That light rail transit line(轻轨), __ _in July 2009 and ___ in 2012, will be China’s longest light rail transit line in history.
A.
starting, completing
B.
started, to be completed
C.
to start, completed
D.
starting, completed
【简答题】III. 从方框中选择合适的句子填空,使对话完整、通顺。 A. It’s too cold.B. It’s for dinner. C. In 30 minutes. D. The soup will be ready soon. E. You had some yesterday, right? A: Mum, what are you doing now? B: I...
【简答题】请根据你的了解,叙述C++ 的特点。C++ 对C有哪些发展?
【单选题】Your bad teeth are caused by too much sweet food.
A.
So I should try to eat more.
B.
Yes. Thank you for advice.
C.
I am going to see the doctor.
D.
Because I am fond of cookies and cakes.
【单选题】In the building of the rail lines, ______.
A.
more equipment made in China should be used
B.
more imported equipment should be used
C.
more exported equipment should be used
D.
more equipment used in infrastructure projects should be used
【单选题】That light rail transit line(轻轨)，started in July 2009 and _________in 2012, will be China’s longest light rail transmit line in history.
A.
completing
B.
to be completed
C.
completed
D.
complete
相关题目：