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【多选题】
InnoDB 引擎与 MyISAM 引擎相比,有哪些优越之处?A.
InnoDB 可以支持外键
B.
InnoDB支持事务
C.
InnoDB上的事务只可能锁住需要更新的行
D.
InnoDB表不可能丢失数据
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【简答题】某兴趣小组在研究冰熔化实验时，发现冰熔化时有快有慢，他们想知道影响冰熔化速度的因素，于是提出了以下两种猜想： 猜想1：环境温度可能会影响冰熔化速度。 猜想2：冰的形状可能会影响冰熔化速度。 （1）请你列举生活中一个实例说明“猜想1”是合理的：______ （2）小丽同学对“猜想2”有自己的想法，为了验证“猜想2”，小丽设计了如下实验方案： （a）量出50mL蒸馏水3份，分别倒入容积都为50mL的长...
【单选题】. He was just about to give up and return to his bedroom for a good rest ________ he had a bright idea.
A.
but
B.
while
C.
until
D.
when
【单选题】In what way is Justin's backpack a smaller version of his bedroom?
A.
He uses it as a place to store objects.
B.
He uses it to carry his books and sports equipment.
C.
His parents tell him to clean it all the time.
D.
He's had it for as long as he can remember.
【单选题】— . —He usually cleans his bedroom. [ ]
A.
How often does your brother clean his bedroom?
B.
What does your brother usually do on weekends?
C.
What's your brother's favorite program?
D.
How many hours does your brother sleep every night
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