问题
单项选择题
标况下，CH4的密度是（）kg/M3。
A.1.1
B.1.29
C.0.8
D.0.717
答案
参考答案：D
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标况下，CH4的密度是（）kg/M3。
A.1.1
B.1.29
C.0.8
D.0.717
参考答案：D
| In most cases, you can transplant a tree successfully, at any time, if you follow the instructions for planting a tree. The most important thing is to dig out enough roots, but this process is difficult with a large tree. When you dig out the tree, leave a ball of earth around its roots. This ball of earth should measure about a foot wide for every inch of the tree trunk’s diameter. Dig deep enough to avoid cutting off too many taproots. It is wise to call in a professional tree expert to transplant a tree more than a few inches in trunk diameter. |
Transplanting a tree is ______.
A．very different from planting a tree
B．so difficult that an expert should always be called in
C．much like planting a tree
D．done successfully in the right seasons