题目内容：
在止回阀上装设（），止回阀关闭后，再缓慢关闭此阀，能降低水击力。
参考答案：
单选：在止回阀上装设（），止回阀关闭后，再缓慢关闭此阀，能降低水击力。
- 题目分类：安全生产法及相关法律知识
- 题目类型：单选
- 查看权限：VIP
不能提高淬透性的合金元素是（）。
不能提高淬透性的合金元素是（）。A．MnB．SiC．Ni
请选出划线部分读音不同的选项（ ）。
请选出划线部分读音不同的选项（ ）。
"Troublemaker"was what was given to my friend Peter by his teachers. They also s
"Troublemaker"was what was given to my friend Peter by his teachers. They also said that he had no f
In nearly every town or city center in the UK, on most days of the week you can
In nearly every town or city center in the UK, on most days of the week you can find one or more peo
根据下列短文，回答{TSE}题。 There are various in which individual economic units
根据下列短文，回答{TSE}题。 There are various in which individual economic units Can interact with one another．Three basic ways may be described as the market system，the administered system and the traditional