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【简答题】
MCS-51系列单片机内设有______个可编程的______位定时器/计数器。
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反馈参考答案：
举一反三
【单选题】We must learn to ___________ risks, because if we can't see the risks we're taking, we can't make responsible choices.
A.
understand
B.
recognize
C.
feel
D.
experience
【单选题】北京犬,10岁,频尿,排尿困难,X线检查可见膀胱内有大小不等的高密度影。最可能的红尿性质是(2018真题下90)
A.
血尿
B.
血红蛋白尿
C.
肌红蛋白尿
D.
卟啉尿
E.
药物性红尿
【单选题】We must learn to see things in their right ______ and avoid making mistakes.
A.
prospective
B.
prosperity
C.
perspective
D.
permissive
【单选题】We must learn to see things in their right _____ and avoid making mistakes.
A.
prosperity
B.
perspective
C.
property
D.
D prospect
【简答题】液压控制系统的作用?
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