以下________不是Visual FoxPro中合法的常量。A．“变量” B．

应急照明集中电源的输出支路和集中控制型系统的控制线路在竖井内敷设、且与竖井内的燃烧性能为B1级以下电线电缆之间有防火分隔时，可选择燃烧性能为（）级的电线电缆。

A.A

B.B1

C.B2

D.B3

以下关于牙体预备中牙髓保护的说法正确的是（）

A.牙体预备分次完成

B.轻压磨切

C.尽量少磨牙

D.预备时间歇、短时磨切

E.水雾冷却

何邡因参与斗殴致残而上诉，法院经审理后，认为何邡有重大过错，驳回他的诉讼请求。何邡的父亲认为法院断案不公，遂召集亲朋好友几十人到法院门口示威。他们辱骂法官，阻塞交通，破坏法院的公共设施，还声称自己在维护合法权益。

何邡的父亲是否依法行使了权利？请说出你的理由。 

下列现象能说明空气中含有二氧化碳的是（　　）

A．饼干放置在空气中变软

B．夏天食品容易变质

C．石灰浆放置在空气中变硬

D．钢铁在潮湿的空气中易生锈

Christmas is the anniversary of the birth of Christ, generally celebrated on December 25. It is one of the chief festivals of the Christian calendar and is (51) a social and family holiday. Christmas customs vary from (52) and among groups of different national (53) In most areas, however, homes and public places are (54) with evergreens, Christmas trees, (55) lights, and glittering ornaments. It is the busiest time of the year for merchants, and shops are filled (56) lavish displays and merchandise of all sorts. People send Christmas cards and buy gifts for their families and friends. Children look forward to (57) Santa Claus. They (58) their stockings on Christmas (59) and on Christmas morning they discover the gifts that have been left for them during the night. In the afternoon, families gather to (60) presents and to share the traditional Christmas dinner.

54().

A.hanged 

B.hung 

C.painted 

D.decorated