皮皮学，免费搜题
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【判断题】
流量控制阀就是依靠改变阀口通流截面积(节流口局部阻力)的大小或通流通道的长短来控制流量的液压阀类A.
正确
B.
错误
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
【单选题】某乡有人口2万人约5000户，欲以户为单位抽其中2000人进行某病的调查若按该乡家庭人口登记名册，随机抽取第1户，随后每间隔几户，再抽取，对被抽到的家庭进行调查。这种抽样方法称为（）
A.
多级抽样
B.
整群抽样
C.
分层抽样
D.
系统抽样
E.
简单抽样
【单选题】听力原文：W: Hello Jack! You don't look well, and what seems to be the problem? M: Actually it is big suffering for me. Every year almost this time, I must come down with something. W: What are symptoms do...
A.
Staying long outside.
B.
Working overtired.
C.
Working with patients.
D.
Wearing few clothes.
【判断题】The young man says while he opens the suitcase. 在这句话中,opens the suitcase指的是在你的手提箱中。
A.
正确
B.
错误
【单选题】He opens the door for her and lets her precede him through it.
A.
went before
B.
proceed
C.
passed through
D.
attributed to
【简答题】We (hide) ____________ when Tony (arrive) _____ at his surprise party. As soon as he opens the door, we (jump) _______________ out and (scream) ______surprise!”
【单选题】He opens the shipment, only to find that the products were poor quality.
A.
excitedly
B.
excited
C.
exciting
D.
excite
【单选题】开展动物实验过程中,以下哪些做法是正确的( ):
A.
废弃的动物尸体和器官可作为饲料再利用
B.
废弃的动物尸体和器官可自行焚烧处理
C.
实验动物的排泄物可以作为肥料再利用
D.
实验动物的获得应从国家指定的具有资质的单位获得
相关题目：
【判断题】The young man says while he opens the suitcase. 在这句话中,opens the suitcase指的是在你的手提箱中。
A.
正确
B.
错误