法律的约束对象是 [ ]
A.违法的人
B.成年人
C.全体社会成员
D.未成年人
答案:C
若某共价化合物分子中只含有C、N、H三种元素,且以n(C)、n(N)分别表示C、N的原子数目,则H原子数目最多等于 [ ]
A. 2n(C)+2+n(N)
B. 2n(C)+2+2n(N)
C. 2n(C)+2
D. 2n(C)+1+2n(N)
I don't know if she to my birthday party tomorrow. If she , I'll be very happy.
A. comes; comes B. will come; comes C. comes; will come