If an auxiliary diesel engine coolant temperature is higher than normal, but the thermostat is determined not to be defective, you would suspect a/an
A. cavitation erosion in the water jackets
B. excess corrosion inhibitor in the coolant
C. dirty jacket water cooler
D. defective turbocharger
从扫气口可以观察到下列零部件的工作状态______。Ⅰ.活塞环；Ⅱ.活塞顶；Ⅲ.活塞裙；Ⅳ.活塞杆；Ⅴ.缸套内表面。
A. Ⅰ＋Ⅲ＋Ⅳ＋Ⅴ
B. Ⅰ＋Ⅲ＋Ⅴ
C. Ⅰ＋Ⅱ＋Ⅲ
D. Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ＋Ⅴ
当年的实际GDP为9万亿美元，而上年为8．6万亿美元，那么经济增长率为多少？
A. 10．31％
B. 4．65％
C. 5．67％
D. 7．67％
E. 0．4万亿美元
活塞冷却侧的裂纹是_______
A. 热疲劳裂纹
B. 机械疲劳裂纹
C. 接触疲劳裂纹
D. 蠕变
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