____是篡改信息来源的真实性,信息传输的完整性和系统服务的可用性。
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____是一种参数,它是在明文转换为密文或将密文转换为明文的算法中输入的数据。
You can't move in right now. The house _____ now.
A. has painted
B. is painted
C. is being painted
D. is painting
All the doctors in the hospital insisted that he ______ badly wounded and that he _______ at once.
A. should be; be operated on
B. were; must be operated on
C. be; was operated on
D. was; be operated on
The new library ____; it will be open next year.
A. had been built
B. was built
C. was being built
D. is being built
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