【单选题】It can be inferred from the passage that the author ______.
A.
is in favor of prohibiting passengers' use of electronic devices completely
B.
regards it as unreasonable to exercise a total ban during flight
C.
hasn't formed his own opinion on this problem
D.
has overestimated the danger of electromagnetic interference
【单选题】每组三个标识符,下面可以用作C语言用户标识符的一组标识符是______ 。
【单选题】What is being discussed in this passage?
A.
The writing of a composition.
B.
The finding of materials.
C.
The writing of a research paper.
D.
The writing of an essay.
【简答题】密码学的发展历程可以分成三个阶段: 、 和现代密码。
【单选题】每组三个标识符,下面可以用作C语言用户标识符的一组标识符是______ 。
【单选题】每组三个标识符,下面可以用作C语言用户标识符的一组标识符是______
【单选题】It can be inferred from the passage that the author ______.
A.
is in favor of prohibiting passengers' use of electronic devices completely
B.
has overestimated the danger of electronic devices completely
C.
hasn't formed his own opinion on this problem
D.
regards it as unreasonable to exercise a total ban during flight