病程在10年以上者,发病率超过50%,而且多较严重()
A.视物模糊
B.糖尿病足
C.白内障、青光眼
D.饭后反应性低血糖
E.对称性肢端感觉异常
参考答案:C
By the time I got to school, I realized I_________ my backpack at home.[ ]
A. left
B. had left
C. was leaving
D. had forgotten
平面结构如图所示,自重不计。己知:F=100kN,判断图示BCH桁架结构中,内力为零的杆数是()。
A.3根杆
B.4根杆
C.5根杆
D.6根杆