The foreigners had just left the museum ________ they heard a bomb explode at the exit.
A. before
B. since
C. as soon as
D. when
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can result in a variety of approaches to everyday business activities such as the way in that
Which of the following correctly describes the English phoneme /t？/？
A voiceless alveolar fricative.
B. A voiceless post-alveolar affricate.
C. A voiced palatal affricate.
D. A voiced alveolar fricative.
现代密码学的一个基本原则是：一切密码寓于（）之中。
A. 密文
B. 秘钥
C. 加密算法
D. 解密算法
通常企业在信息化建设时需要投入关量的资金，成本支出项目多且数额大。在业信息化建设的成本支出项目中，系统切换费用属于（）。
A. 设施费用
B. 设备购置费用
C. 开发费用
D. 系统运行维护费用
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