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【单选题】
表达式 !(x>0||y>0) 等价于A.
!x>0||!y>0
B.
!(x>0)||!(y>0)
C.
!(x>0)&&!(y>0)
D.
!x>0&&!y>0
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【简答题】晶体在不同晶向上的性能是 , 这就是单晶体的 现象。 一般结构用金属为 晶体,在各个方向上性能 ,这就是实际金属的 现象。 �
【简答题】晶体在不同晶向上的性能是 ,这就是单晶体的 现象。
【简答题】晶体在不同晶向上的性能是 的。这是单晶体的 现象。一般结构用金属为 晶体,在各个方向上性能是 的,这就是实际金属的 现象。
【简答题】A．He couldn't make any sense out of his course. B．He hash' t taken more than one philosophy course. C．He is a philosophy major. D．He hasn't taken any philosophy course in that department.
【单选题】— He can't find his hat. Have you seen it? — Yes, of course. I _____ it on his bed just now. [ ]
A.
saw
B.
have seen
C.
had seen
D.
to see
【简答题】A．He couldn't make any sense out of his course. B．He hasn't taken more than one philosophy course. C．He is a philosophy major. D．He hasp't taken any philosophy course in that department.
【简答题】晶体在不同晶向上的性能是（），这就是单晶体的各向异性现象。一般结构用金属为多晶体，在各个方向上性能近似相同，这就是实际金属的（）现象。
【单选题】David said that it was because of his strong interest in literature ________ he chose the course.
A.
that
B.
what
C.
why
D.
how
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