作为第二、第三产业和高技术产业发展过程中不可或缺的支撑条件的资源是______。
A.土地资源 B.水资源C.森林资源 D.海洋资源
参考答案:B
—Could you please tell me _____?
--Sure , there is a post office at the end of the road .
A.how can I buy some stamps
B.where I can buy some stamps
C.where I could buy some stamps
D.how could I buy some stamps
某温度下在2L密闭容器中,反应2SO2+O22SO3进行一段时间后SO3的物质的量增加了0.4mol ,在这段时间内用O2表示的反应速率为0.4 mol·L-1·s-1,则这段时间为[ ]
A.0.1s
B.0.25s
C.0.5s
D.2.5s