皮皮学，免费搜题
登录
搜题
【简答题】
水头损失可间接指示过滤介质的污染情况,有利于把握 的时机,是用来判断过滤器是否 的重要指标。
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】itinerar__
【单选题】I am doing ____travle recetly ____trips a month
A.
many; several
B.
many; much
C.
a lot of; several
D.
a lot of; much
【简答题】When you travle abroad , you'd better use___ to pay.
【简答题】遇到粗俗无聊电话时
【单选题】In_____ the incoming air is directed upwards, pushing the exhaust gases before it and then the exhaust gases travle down.
A.
loop scavenging
B.
cross scavenging
C.
uniflow scavenging
D.
supercharging
相关题目：