问题
单项选择题
当某一三相全控桥励磁功率柜的快速熔断器熔断一个时，其整流输出值将降至原来的（）。
A、1／2
B、1／3
C、2／3
D、3／4
答案
参考答案：C
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当某一三相全控桥励磁功率柜的快速熔断器熔断一个时，其整流输出值将降至原来的（）。
A、1／2
B、1／3
C、2／3
D、3／4
参考答案：C
| 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. |
To decide whether you can successfully transplant a tree yourself, you should ______.
A．select your location carefully
B．measure the ball of earth around the tree roots
C．measure the diameter of the tree trunk
D．cut off as many taproots as you can reach