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【多选题】
下列对原核细胞型微生物结构的描述中,正确的是A.
有含肽聚糖的细胞壁
B.
能以二分裂方式繁殖
C.
含有线粒体、内质网、溶酶体等细胞器
D.
细胞核内含染色体遗传物质
E.
无核膜，核质为裸露环状DNA
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【判断题】An LR parser will detect an error when it consults the parsing action table and finds an error entry. All empty entries in the action table are error entries. Errors are never detected by consulting t...
A.
正确
B.
错误
【单选题】You work as a database administrator for Certkiller .com. Because of space constraints， you decided to manually shrink the table. You executed the ALTER TABLE ....SHRINK SPACE statement to shrink the ...
A.
The table is partitioned
B.
The table name is wrong.
C.
It is an index-Organized table （IOT）
D.
The table is stored in locally managedtablespace.
E.
The table is stored in atablespacewhere segment space is managed manually.
【单选题】You work as a database administrator for Supportcenter.cn. Because of space constraints， you decided to manually shrink the table. You executed the ALTER TABLE ....SHRINK SPACE statement to shrink the...
A.
The table is partitioned
B.
The table name is wrong.
C.
It is an index-Organized table （IOT）
D.
The table is stored in locally managedtablespace.
E.
The table is stored in atablespacewhere segment space is managed manually.
【单选题】When adjusting a magnetic compass for error，a deviation table should be made（）.
A.
before correcting for any deviation
B.
after correcting for variation
C.
after adjusting the fore-and-aft and athwartships permanent magnets
D.
before the quadrantal correctors are placed on the compass
【简答题】(中) 的理想气体开始时处在压强 、温度 的平衡态,经过一个等温过程,压强变为 ,该气体在此等温过程中吸收的热量为 ____。
【简答题】3mol 的理想气体开始时处在压强为 6atm 、温度为 500K 的平衡态。经过一个等温过程,压强变为 3atm 。该气体在此等温过程中吸收的热量为 ______ × 10 3 J 。
【单选题】You execute the following command in your Certkiller .com production database to change the width of the CUST_NAME column of the CUSTOMERS table： ALTER TABLE customers MODIFY （cust_nameVARCHAR2 （40））...
A.
The database instance is not available.
B.
The ALTER TABLE command does not have WAIT option
C.
The table or a row in the table is currently locked by another user session.
D.
The database instance is busy processing other user sessions commands.
E.
The CUSTOMERS table has no long running query active at the time when this request is made.
F.
The server process executing the ALTER TABLE command is busy with another command execution
【单选题】You execute the following command in your Supportcenter.cn production database to change the width of the CUST_NAME column of the CUSTOMERS table： ALTER TABLE customers MODIFY （cust_nameVARCHAR2 （4...
A.
The database instance is not available.
B.
The ALTER TABLE command does not have WAIT option
C.
The table or a row in the table is currently locked by another user session.
D.
The database instance is busy processing other user sessions commands.
E.
The CUSTOMERS table has no long running query active at the time when this request is made.
F.
The server process executing the ALTER TABLE command is busy with another command execution
【简答题】3mol 的理想气体开始时处在压强为 6atm 、温度为 500K 的平衡态。经过一个等温过程,压强变为 3atm 。该气体在此等温过程中吸收的热量为 ______ × 10 3 J 。
【简答题】const int hash_size = 997; // a prime number of appropriate size class Hash_table { public : Hash_table(); void clear(); Error_code insert( const Record &new_entry); Error_code retrieve( const Key &t...
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