问题
单项选择题
新型MANB&W柴油机喷油器针阀下部有切断杆伸入喷油嘴内，这种喷油器进行试验检查时，不能检查的项目是（）。
A．止回阀开启压力
B．针阀启发压力
C．密封性
D．雾化质量
答案
参考答案：D
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新型MANB&W柴油机喷油器针阀下部有切断杆伸入喷油嘴内，这种喷油器进行试验检查时，不能检查的项目是（）。
A．止回阀开启压力
B．针阀启发压力
C．密封性
D．雾化质量
参考答案：D
| 选择适当的单词或词组填空。 | |
It was a cold day. And the snow was heavy. She was driving home from work at nine p.m. As there was snow on the road, she drove very 2 . But unluckily, the car 3 suddenly. She couldn't start it. And what was worse, she couldn't open the door. She felt very helpless and didn't know what to do. So she telephoned my father using her mobile phone. But my father happened to be in another city. There were few people on the road and the snow 4 to fall around her car. She had to call 110 for help. Two policemen arrived 5 . They tried many ways to open the door. And my mother came back home in their police car in the end. She gave us a surprise! |