【单选题】下列各种混合溶液中可作为缓冲溶液的是( )。
A.
50ml0.1mol · L -1 NaOH+100mL0.1mol · L -1 HAc
B.
50ml0.1mol · L -1 NaOH+25mL0.1mol · L -1 HAc
C.
25ml0.2mol · L -1 HNO 3 +25mL0.2mol · L -1 NaAc
D.
25ml0.2mol · L -1 NaOH+12.5mL0.2mol · L -1 HCl
【单选题】下面四个选项中,均是合法整形常量的选项是 ()
【简答题】下面四个选项中,均是合法整形常量的选项是A. 160 -0xffff 011 B. -0xcd 01a 0xe C. -01 986,0120668 D. -0x48a 2e5 0x
【单选题】Rebecca consumes both iced tea and coffee. Iced tea is priced at $1.50 per bottle and coffee at $2.00 per 16-ounce cup. Which of the following marginal utility pairs is consistent with Rebecca's consu...
A.
MU of iced tea = 1; MU of coffee = 1
B.
MU of iced tea = 1; MU of coffee = 2
C.
MU of iced tea = 2; MU of coffee = 3
D.
MU of iced tea = 3; MU of coffee = 4
【单选题】下列各种混合液中,可以作为缓冲溶液使用的是( )
A.
0.1 mol/L HCl与0.1mol/LNaOH等体积混合
B.
0.1 mol/L HAc与0.1mol/LNaAc等体积混合
C.
0.1 mol/L HCl与0.1mol/LNH3等体积混合
D.
0.1 mol/L NaOH与0.1mol/LNH3等体积混合
【单选题】有如下函数 fun (float x) { printf("\n%d",x*x); } 则函数的类型是 ( )。
【单选题】有函数 fun ( float x ) { float y; y= 3*x-4; return y; } ,其函数值的类型是( )。
【单选题】有函数 float fun ( float x ) { float y; y= 3*x-4; return y; } ,其函数返回值的类型是( )