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【单选题】
达尔文进化学说的中心内容是()
A.
用进废退学说
B.
自然选择学说
C.
过度繁殖学说
D.
生存斗争学说
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参考答案:
举一反三
【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】They were determined to carry out the research at once.
A.
fetch
B.
conduct
C.
attract
D.
push
【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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