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2 前面用递归方式给出了行列式的运算规则，下面试用递归的思想方法求解两个数学题。 (1)导出n个不同元素无重复的全排列公式P n ； (2)已知首项为a，公比0≤q＜1的无穷等比级数之和S是有限量，试求S。
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【单选题】The. firm, . shop, . web, . arts, . rec, . info and. nom domains are NOT nm by
A.
a temporary committee organized by Internet's influential services.
B.
the US government.
C.
88 registrars.
D.
Internet Council of Registrars.
【简答题】According to the last paragraph, “paper plates” is to “china” as ________. [A] “temporary” is to “permanent” [B] “radical” is to “conservative” [C] “functional” is to “artistic” [D] “humble” is to “no...
【单选题】听力原文：W: I want to register for this mathematics course. M: I'm sorry registration has dosed. W: Closed? The clerk told me I could come back and register any time during the first week of classes. M: W...
A.
She doesn't want to pay the late fee.
B.
She was given incorrect information.
C.
She can't afford to pay her tuition.
D.
She didn't want to pay her tuition.
【简答题】什么是一次能源和二次能源?请分别说出其中的三种。
【简答题】什么是一次能源和二次能源？
【单选题】Russia put off its manned spacecraft mission because
A.
the astronauts needed to be temporarily evacuated.
B.
an unmanned ship using a similar rocket crashed last week.
C.
the supplies at the space station were not abundant.
D.
the degree of radiation had a huge rise recently.
【多选题】该培训专员他具体做了哪些事情?完成了哪些工作?
A.
开展培训会议
B.
了解每个部门的培训需求
C.
沟通安排培训事宜（时间、授课地点、联系培训专家）
D.
制定培训计划
E.
进行培训总结（了解培训反馈与效果）
【简答题】什么是一次能源和二次能源？
【单选题】听力原文：W: I want to register for this mathematics course. M: I'm sorry registration has closed. W: Closed? The clerk told me I could come back and register any time during the first week of classes. M: ...
A.
She doesn't want to pay the late fee.
B.
She was given incorrect information.
C.
She can't afford to pay her tuition.
D.
She didn't pass her mathematics class last semester.
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