已知反应A+ B = C+ D, 且A与 B参加反应的质量比为4:3, 若反应后生成 C和 D共 2.8 g, 则消耗的反应物 B的质量为（）

A.λ=μ

B.λ=-μ

C.λ=2μ

D.λ=3μ

下面程序的功能是:计算1 10之间的奇数之和与偶数之和,请填空。 include main() { int a,b,c,I; a=c=0; for(I=0;I＜=10;I+=2) {a+=I; 【 】; c+=b; } printf("偶数之和=%d\n",a); printf("奇数之和=%d\n",c-11);}

ent is a- b- c- d-. Data from the transformed cells are shown below. a+ and b+ 2 a+ and c+ 0 a+ and d+ 5 b+ and c+ 5 b+ and d+ 0 c+ and d+ 0 What is the order of the genes？

A、a c b d

B、a d c b

C、c b a d

D、c a d b

A.180°

B.270°

C.360°

D.540°

A.180°

B.270°

C.360°

D.540°

A.A+

B.C+

C.E+

D.O+

A.硫化氢

B.A+氯化物

C.B+少量水蒸汽

D.C+少量的氨

证明：对任意4个向量a，b，c，d，有

(b，c，d)a+(c，a，d)b+(a，b，d)c+(b，a，c)d=0

A.A+

B.B+

C.C+

D.D+

[习题1.29] 证明：对任意4个向量a，b，c，d，有

(b，c，d)a+(c，a，d)b+(a，b，d)c+(b，a，c)d=0

A.80°

B.90°

C.170°

D.20°