下面对“点隙”的解释哪一个是正确的（） A.为位于前牙舌面及后牙面的不规则的凹陷 B

根据《会计法》的规定，业务收支以人民币以外的货币为主的单位，可以选定某种人民币以外的货币为记账本位币，但是编报的会计报表应当折算为人民币反映。 ( )

阅读理解，判断对"√"错"× " 。

    Jane always goes to school early(早).She likes to play with her friends beforc class. But after school she doesn't go home early. Because she always (总是) goes to look at the dogs in the pet shop (宠物店)

every day. She likes to watch the white dog in the window of the shop. It is lovelier (更可爱) than the

other dogs.

     Today is Jane's birthday. Mum shows her a big birthday cake and Dad gives her a present- the lovely white pet dog! Jane is very happy. From now on Jane will come back home early after school.

(      ) 1. Jane is a litile school girl.

(      ) 2. She goes to school early because she likes her school very much.

(      ) 3. She goes to look at the dogs in the pet  shop(宠物店 ) every day.

(      ) 4. The white dog looks lovelier than the others.

(      ) 5. Today Jane  gets  (得到 ) the lovely white pet dog.

已知数列{a_n}的前n项和为S_n=2ⁿ-1，则数列{a_n}的通项公式为______．

培训教学的基本环节包括：1备课；2教学对象分析；3培训；4培训效果总结与反馈；5培训考核。这五个环节的正确顺序是（）。

A.1-2-3-4-5

B.2-1-3-5-4

C.2-1-3-4-5

D.1-2-3-5-4

在单母线接线中，任何一条进、出线断路器检修时，该线路必须停电。（