929、高压电环境下工作时,请遵守安全注意事项。

　0bey the safety cautions when you do work with high capacitance.

　0bey the safety precautions when you do work with high voltages.

　0bey the safety warnings when you do work with high impedance.

正确答案：B

解析：

解析:注释:capacitance 电容; voltage 电压;impedance 阻抗。

559、Turbine engine tachometers usually measure speed as a percentage of the nominal maximum speed ofthe turbines.

558、All persons in this area must use a respirator.

557 、 The ozone converter prevents damage to the air separation module from oxidation of the membranematerial by ozone.

556、将溢流阀门拔动开关保持在打开位置，直到流出阀位置指示器显示完全打开。

555、Loosen the screws that attach the clamp to the support.

554、The diagram shall be arranged so that the flow of the system dan be traced with a minimum of effort. 图表的安排应使系统的流程能够以最小的努力进行跟踪。

553、The precision of the gauges must agree with the applicable quality standard.

552、通气油箱排放单向活门是在 1 号和 2 号主油箱外侧油箱端部肋上。

551、温度调节是自动的。

550、等第一层油漆完全干透后再涂第二层。