相关关系中的正相关指的是两个变量的数量变动方向都是上升的。
参考答案：错
The manager interviewed everyone involved in the accident to find out the truth behind ____ had
actually happened.[ ]
A. what
B. that
C. which
D. it
水磨石机每班工作结束后，应（）以免电动机或电器受潮.
A.切断电源
B.擦拭机械
C.停放干燥处
D.以上均是
