was most important to her, she told me, was her family.[ ]
A.It
B.This
C.What
D.As
答案:C
甲状腺术前可选用()
A.丙硫氧嘧啶
B.甲状腺激素
C.131I
D.大剂量碘
E.普萘洛尔
一辆汽车装满货物的重为5×104N,在平直公路上由东向西行驶,汽车牵引力为8×103 N,汽车受到阻力为汽车总重力的0.1倍,则汽车在水平方向的合力大小为 N,方向向西.