长江中下游平原作为全国“粮仓”的地位让位于东北平原的原因是()
A.土地质量比较差
B.耕地破碎,人均少
C.水稻土肥力下降
D.水网密布河湖众多
参考答案:B
Bob thought he couldn’t go to the party because he had too much homework, but persuaded by his friends, he went _________.
A.above all
B.in all
C.after all
D.first of all
石油产品水分测定试验要严格控制蒸馏速度,从冷凝管的斜口以每秒钟滴下冷凝液()滴为宜。
A.3~4
B.1~2
C.2~4
D.4~5