任何时刻，电路的输出状态只取决于该时刻的输入，而与该时刻之前的电路状态无关的逻辑电路，称为组合逻辑电路。
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根据马克思主义的基本观点,人类历史的发展经历了原始社会、奴隶社会、封建社会、资本主义社会、新民主主义社会、社会主义社会六种基本的社会形态。()
A. 对
B. 错
This is my pen, _____that is your pencil.
A. in
B. of
C. and
D. but
I love ice-cream,______ I can't eat too much, because I don't want to be fat.
A. and
B. but
C. or
D. so
She doesn't send emails _____watch movies on computer.
A. and
B. or
C. so
D. but
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