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射孔完指下入油层套管封固产层，然后用射孔弹将套管、水泥环、部分产层射穿，形成油气流通道的方法。A.
错
B.
对
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举一反三
【简答题】According to Piaget, thought or thinking has its origin in actions physically performed and then internalized. In other words, thought is ______ actions.
【多选题】化学突触传递冲动时,以下哪几项是正确的
A.
突触前膜的 Ca 通道开放，Ca 由细胞外进入突触小体内
B.
突触小体内的突触素磷酸化，并与突触小泡解离，突触小泡与突触前膜融合
C.
突触小泡进入突触间隙
D.
与突触前膜融合的突触小泡通过出胞作用，释放内容物进入突触间隙
E.
突触后膜的受体与特异性神经递质结合，膜内离子通道开放导致离子流动，引起膜两侧电位发生变化，从而产生突触后电位
【简答题】(2求函数值2-1)设函数 , 则f(2)= .
【单选题】听力原文：W: I'd like to talk to someone about the T-shirt.It has shrunk to half its original size. M: Sorry,madam,we've had a lot of complaints about the T-shirts.Don't worry,you'll be paid total compensa...
A.
She'll get her money back from the shop.
B.
She can exchange the T-shirt for a larger one.
C.
She'll have to talk to the manager about it.
D.
She can complain to the Consumers' Association.
【单选题】The ill luck associated with 13 is supposed to have its origin in ______.
A.
legend
B.
religion
C.
popular belief
D.
certain customs
【单选题】一个 n × n 的对称矩阵,如果以行或列为主序放入内存,则容量为。
A.
n2
B.
n2/2
C.
n(n+1)/2
D.
(n+1)^2/2 (n+1的平方除以2）
【简答题】一个n×n的对称矩阵，如果以行或列为主序存入内存，则其容量为多少?
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