For example, all a VFR pilot has to do to enter Class C airspace is establish two-way radio contact with ATC.

例如，VFR 飞行员进入 C 类空域所要做的就是与空中交通管制建立双向无线电联系。

No explicit permission from ATC to enter is needed, although the pilot must continue to obey all regulations governing VFR flight.

尽管飞行员必须继续遵守有关视觉飞行规则的所有规定，但无需获得空中交通管制的明确进入许可。

However, this purely visual system was useless in bad weather, and, by the 1930s, radio communication was coming into use for ATC.

然而，这种纯粹的视觉系统在恶劣天气下毫无用处，到了20世纪30年代，无线电通信开始用于空中交通管制。

The first region to have something approximating today's ATC was New York City, with other major metropolitan areas following soon after.

第一个出现类似现在的航空交通管制的地方是纽约市，很快，其它大城市也开始效仿。

In the 1940s, ATC centres could and did take advantage of the newly developed radar and improved radio communication brought about by the Second World War, but the system remained rudimentary.

在20世纪40年代，空中交通管制中心能够而且确实利用了第二次世界大战中新研制的雷达和改进的无线电通讯，但是这个系统还处于初级阶段。

First, ATC extends over virtually the entire United States.

首先，空中交通管制几乎覆盖了整个美国。

This is because ATC control of the entire space is essential.

这是因为航空交通管制（ATC）对整个空间的控制是至关重要的。

To enter Class B airspace, such as an approach to a major metropolitan airport, an explicit ATC clearance is required.

需要持有明确的空中交通管制许可才能进入B类空域，如接近一个大都会机场。

Many people think that ATC consists of a row of controllers sitting in front of their radar screens at the nation's airports, telling arriving and departing traffic what to do.

许多人认为，空中交通管制系统是由一排坐在美国机场雷达屏幕前的管制员组成的，他们告诉到达和离开的航班该做什么。

After replaced No. 2 ATC transceiver, test OK.

更换2号ATC收发机后，测试正常。

Remove atc from the group, as shown in Listing 23.

从组中删除at c，见清单23。

Suppose there was a mistake and user atc was not supposed to be removed.

假设这是错的，不应该删除atc用户。

The controller's memory is another key factor in accomplishing the ATC mission.

管制员的记忆是在完成管制任务中的另一重要的因素。

ATC clears you to Beijing at 10000m. After take-off straight climbing to 10000m.

空中交通管制放行你到北京，高度10000米。起飞后直接爬高到10000米。

Nanjing airport is closed for ATC, the departure time is not sure, pay attention to the broadcast.

南京机场因航空管制关闭了，起飞时间不能确定。请您注意听广播。

You are also not allowed to communicate on any text or voice frequency in use by pilots and regular ATC.

同时，也不得在正式管制员与飞行员通讯的频率上进行文字和语音通讯。

On the basis of the motion graph, the roller-gear-cam and driven roller in ATC are given a motion analyze.

介绍了自动换刀装置的换刀过程、滚子齿形凸轮机构的运动循环图设计，并进行了分析。

A new smooth available transfer capability (ATC) model is constructed based on smooth function transformation.

基于光滑化函数理论，建立了光滑化的可用传输容量(atc)新模型。

The new generation of display technology is the requirement of the future ATC system for Civil Aviation of China.

新一代的显示技术也是我国民航未来空中交通管制系统的需求。

To overcome it, based on the theory of smooth function, a new smooth ATC model is presented in this dissertation.

为了克服这一困难，论文基于光滑化函数理论，建立了光滑化的AT C新模型。

The results proved that it was feasible to count the ATC of metal solid objects by using its special and general ERSC.

计算的结果证明用狭义和广义等效辐射截面系数来计算立体金属目标的天线温度对比度是可行的。

This means that ATC procedures that generate less workload than others tend to be used more frequently as task demands increase.

这意味着当工作任务增加时，那些比其他方案产生较少工作负荷的管制程序将被更多的使用。

Instead, user atc was supposed to become the administrator of the group, while xander's administrative rights were to be removed.

相反，应该把atc用户变成组管理员，删除xander的管理权限。

The Automatic Temperature Compensation (ATC) mechanism automatically adjust the readings for temperature variations of the solution.

自动温度补偿测量仪（ATC）自动调节溶液温度改变的读数。

This paper presents a new approach for calculating available transfer capability (ATC) with generation bidding in electricity market.

提出了一种在电力市场环境下考虑发电报价的可用输电能力计算方法。