一般情况下,经济车速是汽车最高设计车速的()。
参考答案:50%-75%
南方地区与北方地区相比占有明显优势的资源是[ ]
A.水能和有色金属
B.煤炭
C.石油、天然气
D.森林资源
Hard work ______ success while failure often ______ laziness.[ ]
A. lies in; leads to
B. leads to; lies in
C. leads to; depends on
D. depends on; leads to