胆管癌典型征象为()。
A.声且伴声影
B.胆管壁均匀性增厚
C.扩张的胆管突然中断并见软组织肿块
D.管呈囊性扩张的无回声区
E.胆管走行扭曲
参考答案:C
If you are loading fruit in reefer spaces and you notice that the fruit is beginning to mold, you should().
A.carry the cargo at a cooler temperature than originally planned
B.write up exception on the cargo
C.refuse to carry the cargo
D.discharge CO2 into the compartment after loading
检验动力转向系统流量控制阀工作性能的方法有()
A.检验发动机在怠速范围内急加速时系统内的油压降
B.检验无负荷时的油压差
C.检验发动机转速稳定在1500-1600r|min时的系统油压
D.测量动力转向器的有效油压