用“*”表示一种新运算,它是这样定义的:A*B=A×B﹣(A+B),则3*6=( )。
9
— The window must have taken you quite a lot of time that day.
— Right. They____ for weeks.
A.haven’t been cleaned
B.hadn’t been cleaned
C.didn’t clean
D.haven’t cleaned
男,53岁,2年前被踢伤胸部,胸片及CT如图,下列描述或诊断正确的是()
A.胸片可见纵隔类圆形高密度影,以侧位片明显
B.CT增强扫描示,造影剂流入球形病灶内
C.结合临床,考虑为主动脉夹层
D.球形病灶外围见半月形低密度影,其内有斑片状高密度影,拟为血栓
E.结合临床,考虑为主动脉假性动脉瘤(外伤性)