A.土2.5%(體積分數(shù)) B.土0.35%(體積分數(shù)) C.土1.0%(體積分數(shù)) D.土1.5%(體積分數(shù))
A.土0.2%(體積分數(shù)) B.土0.35%(體積分數(shù)) C.土1.0%(體積分數(shù)) D.1.5%(體積分數(shù))
A.A B.B C.C D.D