If (),the density variations influence the flow and compressibility effects should be accounted for; such flows are compressible flows.
A.M>0.3
B.M<0.3
C.M>0.2
D.M>0.1
- · 有5位网友选择 B,占比50%
- · 有3位网友选择 D,占比30%
- · 有2位网友选择 A,占比20%
A.M>0.3
B.M<0.3
C.M>0.2
D.M>0.1
Air is composed of ______ gases including hydrogen, oxygen and carbon dioxide.
A. varied B. variant
C. variable D. various
______ (即使计算是正确的) ,scientists can never be sure that they have included all variables and modeled them accurately.
Show that the variance of the random variable X1–E(X1|X2) cannot be greater than the variance of X1, and that the two variances are equal if X1 and X2 are independent. This result shows how one random variable can be informative about another: Conditioning on it reduces variance unless the two variables are independent.
A.More cost
B.More density
C.Less cost
D.Less density
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