皮皮学，免费搜题
登录
搜题
【单选题】
BOD是指A.
总需氧量
B.
生化需氧量
C.
化学需氧量
D.
总有机碳含量
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】下列说法错误的是()
A.
人耳接受的声音频率范围为1000-3000赫兹
B.
一个sone是指40分贝时1000赫兹的纯音声音刺激的响度感觉
C.
速度和准确性是反应时实验中的两个基本因变量
D.
在用最小变化法测定差别阈限的实验中，上限和下限之间的距离的中点叫做主观相等点
【单选题】The old man sat in front of the television every evening, happy _____ anything that happened to be on.
A.
to watch
B.
watching
C.
watched
D.
to have watched
【简答题】完形填空。 A young man and an old man were waiting for a bus at a station. They sat next to each other.'What's that in your bag?' asked the young man, pointing to the big bag beside the 1 'Money,' answered...
【单选题】The old man sat before the fire in a trance, thinking of his past life.
A.
in a special position
B.
in a cozy state
C.
in a sleepy state
D.
in a meditative state
【简答题】按照网络的作用范围进行分类,从小到大可以分为: ____________ , ____________ , ____________ , ____________ 。
【简答题】The old man sat in the park and read a newspaper . The old man sat in the park, _ _________________ __.
相关题目：