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【单选题】
混凝土抗冻等级F15中的15是指()A.
承受冻融循环的最大次数是15次
B.
冻结后在15°C的水中融化
C.
最大冻融循环次数后质量损失率不超过15%
D.
最大冻融循环次数后强度损失率不超过15%
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【单选题】Europe has achieved more in controlling the AIDS virus than Asia in the past ten years, ______ the number of people infected with the virus is going up sharply.
A.
when
B.
which
C.
that
D.
where
【单选题】Asynchronous counters are often called ________ counters.
A.
flip-flop
B.
toggle
C.
binary
D.
ripple
【简答题】A．regards B．suggests C．supports D．counters
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【判断题】Synchronous counters are generally faster than asynchronous counters in operation.
A.
正确
B.
错误
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