SMA沥青混合料应采用( )拌和机拌和。
A.连续滚筒式
B.双锥反转出料式
C.间歇式
D.鼓筒式
参考答案:C
The old man asked the children to _____ to each other near the campfire so that he could start telling his story at once.
A.take up
B.stay up
C.close up
D.turn up
人类对自然磷的循环的干扰表现在哪两个方面?