原发性高血压病人的血管病变是
A．小动脉病变
B．动脉中层硬化
C．细小动脉硬化
D．大动脉炎症
E．主动脉及其分支的粥样硬化
参考答案：C
After a few years' hard work, they ______ in finish building the big bridge.[ ]
A. developed
B. succeeded
C. searched
D. observed
检查电动机温度应不超过发（）。
A.65℃
B.70℃
C.75℃
D.80℃
