A、0.15
B、0.3
C、0.6
D、0.9
A、阻挡&nm>bm>sm>pm>;&nm>bm>sm>pm>;m>Bm>、缓冲&nm>bm>sm>pm>;&nm>bm>sm>pm>;C、保护&nm>bm>sm>pm>;&nm>bm>sm>pm>;
A、7-30m&nm>bm>sm>pm>;&nm>bm>sm>pm>;m>Bm>、5-20m&nm>bm>sm>pm>;&nm>bm>sm>pm>;C、3-30m&nm>bm>sm>pm>;&nm>bm>sm>pm>;D、5-30m&nm>bm>sm>pm>;&nm>bm>sm>pm>;
A、20m&nm>bm>sm>pm>;&nm>bm>sm>pm>;m>Bm>、25m&nm>bm>sm>pm>;&nm>bm>sm>pm>;C、30m&nm>bm>sm>pm>;&nm>bm>sm>pm>;D、15m&nm>bm>sm>pm>;&nm>bm>sm>pm>;
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