(15)-1+(2008-π6)0-3tan30°
=5+1-3•33
=5+1-1=5.
阅读短文,判断下列句子正(T)误(F)。
Tom is a very clever boy. He studies in Yucai School. He is tall and thin.
But his classmate, Lili, is taller than him. Lili is active and beautiful.
They all love their English teacher. They work hard.
( ) 1. Tom is taller than Lili.
( ) 2. Tom is very clever.
( ) 3. They don't love their English teacher.
( ) 4. Lili is active and beautiful.
( ) 5. Tom is fat and tall.
实性肿瘤声像图特征下列哪项是错误的()
A.边界回声可光滑、整齐或不规则
B.外形常呈圆形、椭圆形或不规则
C.内部有回声
D.后方回声均有衰减
E.侧方声影可有可无