运用中的电气设备可分为哪几种状态?
参考答案:
运用中的电气设备可分为运行、热备用、冷备用、检修四种状态。
Grover Cleveland was the first president ________in the White House.
A.got married
B.to get married
C.has got married
D.was married
下列选项中,不是视网膜母细胞瘤的常见CT表现的是()
A.位于眼球壁内
B.肿瘤内团块状钙化
C.肿瘤密度较低
D.肿瘤增强明显
E.肿瘤可向眼球外膨出