下列关于李刚同学身体的相关物理量的估测,明显不符合事实的是 [ ]
A.身高约170 cm
B.质量约60 kg
C.体温约37 ℃
D.密度约1.0×l03 g/cm3
答案:D
分解因式:
①x2+6x+9=______;
②1-4x+4y2=______;
③-a2+2a-1=______.
—Driving after drinking alcohol should be punished, I think.
—Sure, it is several months________ the ban came to effect in the whole country.
A.before
B.until
C.since
D.after