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皮皮学刷刷变学霸
举一反三
【简答题】音叉以频率振动 ,求离音叉2m处空气振动的表示式.设该处振动的振幅为1mm,音叉振动的初相位为零,空气中的声速为
【单选题】They were determined to carry out the plan at first, but then we  ____ persuade them to change their minds. [     ]
A.
would
B.
could
C.
were able to
D.
had to
【单选题】当输入端 S 和 R 为 ,由或非门构成的基本 SR 锁存器保持原状态不变。
A.
S=1 , R=0
B.
S=0 , R=1
C.
S=0 , R=0
D.
S=1 , R=1
【单选题】当输入端S和R为 ,由或非门构成的基本SR锁存器会出现不稳定状态。
A.
S=0,R=0
B.
S=1,R=0
C.
S=0,R=1
D.
S=1,R=1
【单选题】当输入端S和R为 ,由或非门构成的基本SR锁存器会出现不稳定状态。
A.
S =1 , R =1
B.
S =1 , R =0
C.
S =0 , R =1
D.
S =0 , R =0
【单选题】当输入端S和R为 ,由或非门构成的基本SR锁存器保持原状态不变。
A.
S =0 , R =0
B.
S =1 , R =0
C.
S =0 , R =1
D.
S =1 , R =1
【单选题】当输入端S和R为 ,由或非门构成的基本SR锁存器会出现不稳定状态。
A.
S =1 , R =0
B.
S =0 , R =1
C.
S =1 , R =1
D.
S =0 , R =0
【单选题】They were determined finish the task tonight.
A.
on
B.
of
C.
to
D.
by
【简答题】A. The factory workers were ready. B. They were able. C. They were determined to do a great job.
【判断题】鸿运乳猪成品特点是皮肉松化、肉质嫩滑、入口香脆。
A.
正确
B.
错误
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