皮皮学，免费搜题
登录
搜题
【判断题】
观察法是指在控制的条件下,对研究现象的一个或多个因素进行操纵与测定这些因素之间的关系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
【简答题】支撑的作用是什么？柱间支撑的作用又是什么？
【简答题】Task 1 Punctuate the following passage. most american people are fond of cats and or dogs it is said that every year they spend about $5.4billion on their pets including $1.5 billion on pet food four ...
【简答题】Punctuate the following passage: most american people are fond of cats and or dogs it is said that every year they spend about $5.4billion on their pets including $1.5 billion on pet food four times t...
【单选题】66 直径为250mm的气缸套,其最大极限尺寸Lmax=250.122mm,最小极限尺寸Lmin=250.050mm,实测尺寸L=250.100mm,则其实际偏差为________。
A.
0.022mm
B.
-0.050mm
C.
+0.100mm
D.
0.072mm
【简答题】Tasks that fall under the 20 percent are things that many people usually don’t like doing. However, it is this 20 percent that will play the most important part in your success or failure. Examples of...
【简答题】In Britain, people have different attitudes(态度)to the police. Most people generally 1 them and the job they do, but some people said that the police shouldn’t have special 2 . What does a policeman ac...
【简答题】most american people are fond of cats and or dogs it is said that every year they spend about $5.4billion on their pets including $1.5 billion on pet food four times the amount of money they spend on ...
相关题目：