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【单选题】
对含有两个随机变量的同一批资料,既作直线相关,又作直线回归分析。对相关系数检验的t值为 tr ,对回归系数检验的t值为 tb ,二者的关系是A.
tr > tb
B.
tr < tb
C.
tr = tb
D.
tr ≥ tb
E.
tr ≤ tb
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【单选题】The principal purpose of sub-cooling liquid refrigerant prior to its entering the expansion valve is to _____.
A.
increase the refrigerating effect, by decreasing the amount of flash gas
B.
allow the refrigerant to enter the throttling device in a saturated condition
C.
increase the refrigerating effect by increasing the amount of flash gas
D.
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A.
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B.
extension
C.
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D.
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A.
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B.
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C.
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D.
banana
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