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根据白盒测试法,选择测试用例使程序中每个语句至少被执行一次是属于()覆盖;选择测试用例使程序中每个判定至少都获得一次"真"值和一次"假"值是属于()覆盖。

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设有关系SC(sno,cname,grade),各属性的含义分别为学号、课程名、成绩。若要将所有学生的“数据库系统”课程的成绩增加5分,能正确完成该操作的SQL语句是 【9】 grade=grade+5WHEREcname:"数据库系统"。

DBMS对数据库进行封锁时采用的两种基本锁类型是排它锁(X)和 【16】 。

117-119 男性,26岁,左膝持续性隐痛1月余。查体:左小腿上端内侧略肿,压痛,X线摄片见左胫骨上端内侧有一肥皂泡样的阴影,膨胀性生长,骨皮质变薄。 如果是骨肉瘤,其最佳治疗方案为:

A. 单纯化疗
B. 单纯放疗
C. 单纯截肢手术
D. 肿瘤切除,人工关节置换
E. 化疗-肿瘤切除-化疗

Zoos have become an important site for the preservation and protection of wildlife resources, (61) those species that are endangered. (62) , many zoos displayed live animals for public entertainment. Presently some zoos have become scientific and educational (63) that have contributed to the understanding and conservation of wild animal populations. (64) the challenges facing modern zoos are the cost of upgrading old facilities, the struggle to obtain 65 operating funds, and the need to attract more visitors to new and entertaining exhibits. Many (66) zoos in American cities have undergone renovation (翻新) during the last decades of the twentieth century. Among the recent trends in zoo (67) is the construction of new enclosures that resemble natural habitats (栖息地). The replacement of traditional steel bars and concrete floors (68) appropriately designed surroundings improves visitor appreciation of the animals. Such renovations may (69) stress on animals and allow them to interact with one another more naturally. Several major zoos conduct captive propagation programs. A captive propagation program includes the breeding of (70) zoo or wild animals to obtain offspring, usually for release to (71) or for transfer to other zoos. Captive breeding is one method of 72 some species from extinction. Zoos have expanded and improved public education programs also, with education departments that develop programs (73) zoo exhibits. Public activities include in-school programs, zoos tours, special events, and websites. The Zoological Society of New York, for example, conducted a major project with a Western African government to monitor an elephant herd (74) it moved throughout its range. The importance of zoos will increase as natural habitats are diminishing. Through will their efforts (75) conservation, education, and environmental advocacy, zoos continue to play a critical role in wildlife preservation throughout the world.

Along
B. Toward
C. Among
D. Through

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