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白度测定仪的原理?

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旅游计划一经制订便不可更改

A. 正确
B. 错误

单位对外行文时,公文标题的形式是()

A. 发文机关+事由+文种
B. 发文机关+文种
C. 事由+文种

You are troubleshooting a problem with a Cisco 7920 wireless IP phone on a standalone WLAN.The phone rings but, when you answer, the call is dropped. What may cause this problem?()

A. The minimum data rate is not set to 11 Mbps.
B. An address resolution protocol is enabled.
C. Publicly Secure Packet forwarding is enabled.
D. The access point is set to the least congested channel.

锯削往复运动速度应控制在()次/min左右。

A. 30
B. 40
C. 50
D. 60

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