DDRII内存的CL[CASLATENCY]数值只能达到()
A.4-4-8-8
B.4-4-4-8
C.4-4-4-8
D.4-8-8-8
参考答案:C
-Julia, _________will your son return?
-In a week.
A.how often
B.how far
C.how soon
D.how long
已知:H2(g)+1/2O2(g)==H2O(l) ΔH=-285.8 kJ·mol-1 CH4(g)+2O2(g)==CO2(g)+2H2O(l) ΔH=-890kJ·mol-1 现有H2与CH4的混合气体112 L(标准状况),使其完全燃烧生成CO2和H2O(l),若实验测得反应放热3695kJ,则原混合气体中H2与CH4的物质的量之比为[ ]
A.1∶1
B.2∶3
C.1∶4
D.1∶3