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【单选题】
如果相关系数r=0,则表明两个变量之间A.
不存在线性相关关系
B.
不存在任何关系
C.
存在非线性相关关系
D.
相关程度很低
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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】We couldn't have passed the final examination ______ your help.
A.
but for
B.
without
C.
if it had not been for
D.
All of the above.
【单选题】________ his overdrinking, the accident would not have happened.
A.
If it weren’t for
B.
But for
C.
Not had it been for
D.
Had it not been for
【单选题】If it ______ for the fence, he ______ into the river.A. were not; fallenB. had not been; could h
A.
41. If it ______ for the fence, he ______ into the river. A. were not; fallen
B.
had not been; could have fallen C were not; could fall D. had not been; could fall
【单选题】It ______ for two days. The roads will be locked if it ______ soon.
A.
snowed, won't stop
B.
has been snowing, doesn't stop
C.
has snowed, won't stop
D.
snow, doesn't stop
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