一个班级有78位学生,现采用二进制编码器对每位学生进行编码,则编码器输出至少 位二进制数才能满足要求。
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It is necessary that the problem ______ in some way or other.
A. is settled
B. has been settled
C. be settled
D. was settled
Experiments ______that accurate measurements be made.
A. show
B. prove
C. demand
D. declare
_______________, he would have come to class.
A. If Mike is able to finish his homework
B. Would Mike be able to finish his homework
C. If Mike could finish his homework,
D. If Mike had been able to finish his homework