标准直齿圆柱齿轮的齿数z=32,模数m=3,则 A: da=96 B: d=96 C: df=90 D: da=102

已知直齿圆柱齿轮的齿数Z=50，模数m=2，其齿根圆直径是 A: φ100 B: φ104 C: φ96 D: φ95

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已知标准直齿圆柱齿轮的齿数Z=50，模数m=2，其齿根圆直径是（） A: AΦ100 B: BΦ104 C: CΦ96 D: DΦ95

已知标准直齿圆柱齿轮的齿数Z=50，模数m=2，其齿根圆直径是（） A: AΦ100 B: BΦ104 C: CΦ96 D: DΦ95

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细菌菌体抗原去除鞭毛抗原需（） A: 95℃1～1.5小时 B: 95℃2～2.5小时 C: 96℃2～2.5小时 D: 100℃1～1.5小时 E: 100℃2～2.5小时

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釉质中无机物占总重量的（） A: 94%～95% B: 95%～96% C: 96%～97% D: 97%～98% E: 99%