A.≤4h B.≥4h C.≤12h D.≥12h
A.≤0.041W/(m·K) B.≤0.040W/(m·K) C.≤0.037W/(m·K) D.≤0.034W/(m·K)
A.0.01kPa B.0.1kPa C.1kPa D.10kPa