重力选煤方法主要有()、()、()、()和()。
参考答案:风选;跳汰选煤;重介质选煤;斜槽选;摇床选
Generous public funding of basic science would ________ a good many benefits for the country's
health, wealth and security.[ ]
A. result from
B. lead to
C. lie in
D. settle down
什么是芳香植物资源?