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问题
填空题
为防止接地线受地面上重物压力断裂损伤，接地线埋在地下部分应呈（）形。
答案
参考答案：S
填空题
已知S
n
为等差数列{a
n
}的前n项和，S
10
=100，S
100
=10，S
110
=（ ）。
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选择题
____,the student insists that he be separated from his desk-mate,who is naughty.
A．To avoid being affected
B．To avoid to be affected
C．Avoiding being affected
D．Avoiding to be affected
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