在喷射系统必须放空气的情况中，错误的是（）。A．柴油机停车后

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问题单项选择题

在喷射系统必须放空气的情况中，错误的是（）。

A．柴油机停车后

B．长期停车后，启动前

C．系统管路重新连接之后

D．喷油器拆装之后

答案

参考答案：A

解析：柴油机喷射系统的油道在下述情况空气易混入喷射系统中：（1）柴油机长期停车；（2）喷油泵拆装后；（3）喷油器拆装后；（4）高压油管拆装后。当发生上述情况之一时，柴油机起动前喷射系统必须要排除空气。

阅读理解

When Omega was born in Uganda, she did two things: Smile and then sing. When Omega was 4 years old, her talent(天赋) for music was recognized, so she became one of the youngest members of the first African Children’s Choir(合唱团). She traveled the world with the choir, and it was from this experience that she grew into a singer today.

Although having a beautiful voice, she had to find other ways besides music to earn a living at first. When she was 16, her parents sent her to the USA to study. Like her mother, Omega wanted to become a doctor and do something meaningful in her country of Uganda.

However, like many artists, music was so much a part of her that she had to choose. With encouragement from her family and friends, she opened her own production company(制作公司) after graduation. Since then, she has been working as an artist. Her songs make people feel good about life. Apart from that, she is also interested in health care and education. Omega is one of those Ugandan females who are showing the world their valuable talents.