After each reading of an oxygen indicator, the instrument should be purged with（）...

第1题

[单选题] After each reading of an oxygen indicator，the instrument should be purged with（）.

A、CO₂ B、fresh air C、the tested compartment's air D、water

第2题

[填空题] After reading the novel he was too exciting to go to sleep that night.

第3题

[单选题] The page will be posted to the server after one or more image files are selected for upload.You need to ensure that all unuploaded files are saved to the server within one call to a single event handler. What should you do？（）

A、Read the HttpRequest.Files property and call the HttpPostedFile.SaveAs method for each file. B、Read the HttpRequest.inputStream property and call the System.Io.File.WriteLines method for each file. C、Read the HttpRequest.inputStream property and call the HttpResponse.WriteLine method for each file. D、Read the HttpRequest.Files property and call the System.Io.File.WriteLines method for each file.

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第4题

[多选题] Examine the following command that is used to duplicate a database on the same host: Which two statements describe the effect after the database is duplicated successfully? （）

A、The data files of the read-only tablespaces in the target database are not duplicated B、The read-only tablespaces in the target database are still defined in new the database C、The read-only tablespaces in the target database are changed to online after duplication D、The data files of the read-only tablespaces in the target database get duplicated E、The read-only tablespaces in the target database are not defined in the new database

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第5题

[单选题] The following triggers were defined for table TAB1 in the order shown:CREATE TRIGGER trig_a AFTER UPDATE ON tab1 FOR EACH ROW UPDATE sale_tab SET sale_date = CURRENT DATE; CREATE TRIGGER trig_b AFTER UPDATE ON tab1 FOR EACH STATEMENT UPDATE invoice_tab SET invoice_date = CURRENT DATE; CREATE TRIGGER trig_c AFTER UPDATE ON tab1 FOR EACH ROW UPDATE shipping_tab SET ship_date = CURRENT DATE; CREATE TRIGGER trig_d AFTER UPDATE ON tab1 FOR EACH STATEMENT UPDATE billing_tab SETbilling_date = CURRENT DATE;If an event occurs that causes all of them to activate, which trigger will be activated first?（）

A、TRIG_A B、TRIG_B C、TRIG_C D、TRIG_D

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第6题

[判断题] Writing a comment after each lesson is a useful habit for a teacher to get into.（）

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第7题

[多选题] Examine the following command that is used to duplicate a database on the same host: RMAN> RUN { ALLOCATE AUXILIARY CHANNEL, aux 1 DEVICE TYPE DISK; DUPLICATE TARGET DATABASE TO auxdb SKIP READONLY; \ } Which two statements describe the effect after the database is duplicated successfully? （）(Choose two)

A、The data files of the read-only tablespaces in the target database are not duplicated B、The read-only tablespaces in the target database are still defined in new the database C、The read-only tablespaces in the target database are changed to online after duplication D、The data files of the read-only tablespaces in the target database get duplicated E、The read-only tablespaces in the target database are not defined in the new database

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第8题

[] When two AC generators are being paralleled, the breaker should be closed with the synchroscope pointer mating in the （）

A、A."slow" direction, just before the 12 o'clock position B、B."fast" direction, just after the 12 o'clock position C、C."fast" direction, just before the 12 o'clock position D、D."slow" direction, just after the 12 o'clock position

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第9题

[判断题] I’m afraid our office is closed until nine o’clock tomorrow morning. This sentence means our office will be open after nine o’clock tomorrow morning.

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After each reading of an oxygen indicator, the instrument should be purged with（）.

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