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酶制剂有四种类型即液体酶制剂，固体酶制剂，纯酶制剂和（）

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地漏水封高度一般小于（）mm。

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补偿收缩混凝土应该掺的外加剂是（）。

A. 减水剂；
B. 缓凝剂；
C. 膨胀剂；
D. 发泡剂.

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胰头癌时十二指肠低张造影可见十二指肠降部出现双边征或（）征，十二指肠曲（）。

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An existing master-slave setup is currently using a delayed replication of one hour. The master has crashed and the slave must be "rolled forward" to provide all the latest data. The SHOW SLAVE STATUS indicates the following values: RELAY_LOG_FILE =hostname-relay-bin.00004 RELAY_LOG_POS = 1383 Which command set would make the slave current?（）

A. STOP SLAVE; CHANGE MASTER TO MASTER_DELAY =0, RELAY_LOG_FILE = 'hostnamerelay- bin.00004' , RELAY_LOG_POS= 1383
B. STOP SLAVE; CHANGE MASTER TO RELAY_LOG_FILE = 'hostname-relay-bin.00004', RELAY_LOG_POS = 1383
C. STOP SLAVE; CHANGE MASTER TO MASTER_DELAY=0; START SLAVE
D. STOP SLAVE; SET GLOBAL master_delay =0; START SLAVE

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