[单选]
Click the Exhibit button.

Which statement is true about the set variable on line 12？（）

A . The set variable contains all six elements from the coll collection， and the order is guaranteed to be preserved.
B . The set variable contains only three elements from the coll collection， and the order is guaranteed to be preserved.
C . The set variable contains all six elements from the coll collection， but the order is NOT guaranteed to be preserved.
D . The set variable contains only three elements from the coll collection， but the order is NOT guaranteed to be preserved.

发电机，主要变压器的非计划检修或停止备用，应予先（）小时提前申请。 In your database， UNDO_RETENTION has been set to 600 sec and UNDO tablespace is configured for RETENTION GUARANTEE. Which statement regarding RETENTION GUARANTEE is true？（） Undo data is retained until the next full database backup.。 No committed undo data will be overwritten for 10 minutes.。 Committed undo data will be kept forever if not overwritten within 600 seconds.。 Guarantees that requested undo information are available until the instance is shut down.。商品劳务课税是对（）课征的税收。所得额。财产。商品和劳务。利息。下列关于填充墙砌体工程说法正确的有（）。填充墙顶部与承重主体结构之间的空隙部位，应在填充墙砌筑14日后进行砌筑。蒸压加气混凝土砌块采用专用砂浆或普通砂浆砌筑时，应在砌筑当天对砌块砌筑面浇水湿润。转角及交接处应同时砌筑，不得留直槎，留斜槎时，斜槎高度不宜大于1.2m。厨房采用轻骨料混凝土小型空心砌块砌筑墙体时，墙底部宜现浇混凝土坎台，其高度宜为200mm。砌块进场后应按品种、规格堆放整齐，堆置高度不宜超过2m。检查油嘴时，先关哪个闸门（）生产闸门。回压闸门。总闸门。

Click the Exhibit button.

Which statement is true about the set variable on line 12？（）

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[单选] Click the Exhibit button. Which statement is true about the set variable on line 12？（）

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[单选]
Click the Exhibit button.

Which statement is true about the set variable on line 12？（）