Figure 7 illustrates these three control classes.
图7展示了这三个控件类。
A security and access control model that distinguishes between these two classes of users.
区分上述两类用户的安全和访问控制模型。
We use machine classes you should have declared in the control: section, under AddInstallable().
我们使用您应该已经在AddInstallable()下的control:节中声明的机器类。
Noise suppression is classified into two classes: Passive Noise Control and Active Noise Control.
噪声抑制方法可以分为两大类：被动噪声抑制和主动噪声抑制。
These are the classes which provide the actual control.
这些是提供实际控制的类。
Classes in lab safety and quality control will also be required.
同时需要在安全和质量受控制的实验室进行课程学习。
Be aware of the volume control during the activity to avoid any disturbance to classes.
活动时避免声浪过大，以免影响他人上课。
Be aware of the volume control during the activity to avoid any disturbance to classes.
活动时避免声浪过大，以免影响他人上课。
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