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【单选题】
有关接触器与继电器及其常闭触点的叙述,哪组是错误的? ( )A.
用于小功率负荷电路中，称为继电器；
B.
用于大功率负荷电路中称为接触器；
C.
. 常闭触点是线圈无电时断开，有电时闭合；
D.
电磁式 接触器与继电器结构原理大致相同；
E.
交流接触器的结构由线圈、电磁铁、触点和灭弧装置所组成。
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【单选题】有如下代码,分割出$path_parts的不包含扩展名的文件名使用的语句是: $path = $_SERVER['PHP_SELF']; $path_parts = pathinfo($path);
A.
$path_parts['dirname']
B.
$path_parts['basename']
C.
$path_parts['extension']
D.
$path_parts['filename']
【单选题】The critical path in a network is the path that:
A.
Has the greatest degree of risk.
B.
Will elongate the project if the activities on this path take longer than anticipated.
C.
Must be completed before all other paths.
D.
All of the above.
E.
A and B only.
【单选题】● The critical path in a network is the path that: A Has the greatest degree of risk. B Will elongate the project if the activities on this path take longer than anticipated.
C.
Must be completed before all other paths.
D.
All of the above.
E.
A and B only.
【单选题】● The critical path in a schedule network is the path that:
A.
Takes the longest time to complete
B.
Must be done before any other tasks
C.
Allows some flexibility in scheduling a start time.
D.
Is not affected by schedule slippage
E.
All of the above.
【单选题】Which of the following choices correctly describes the difference between a data load via the conventional path and the direct path?（）
A.
One runs faster than the other
B.
A conventional path data load bypasses most of the Oracle RDBMS, whereas a direct path load is a high-speed version of the SQL INSERT
C.
A direct path data load bypasses most of the Oracle RDBMS, whereas a conventional path load is a high-speed version of the SQL INSERT
D.
The conventional path runs when the CONVENTIONAL command-line parameter is set to TRUE
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