A.≤2.0 B.≤3.0 C.≤4.0 D.≤5.0
A.封閉 B.脫落 C.無(wú)斷裂 D.打開(kāi)
A.玻璃件 B.金屬件 C.木制件 D.塑料件
A.1 B.2 C.3 D.4
A.1.5 B.2 C.2.5 D.3
A.≥H B.≥2H C.≥3H D.≥4H
A.0.1% B.0.2% C.0.3% D.0.4%
A.40 B.60 C.90 D.1000
A.5 B.8 C.10 D.15
A.2 B.3 C.4 D.5