[多项选择]Which of the following fragments might cause errors？（）    
A.  String s = "Gone with the wind"；String t = " good "；String k = s + t；
B.  String s = "Gone with the wind"；String t；t = s[3] + "one"；
C.  String s = "Gone with the wind"；String standard = s.toUpperCase（）；
D.  String s = "home directory"；String t = s - "directory"；

[单项选择]法兰克福国际机场（FRA）位于（）
A. 法国
B. 德国
C. 荷兰
D. 意大利

[单项选择]Which of the following devices is used to move frames between a source and destination basedon a MAC address?（）
A. Repeater
B. Hub
C. Router
D. Switch

[单项选择] In your database, the flash recovery area (FRA) is configured as the default for RMAN backups. You executed the following commands to configure the settings in RMAN: RMAN> CONFIGURE DEVICE TYPE disk PARALLELISM 2 BACKUP TYPE TO BACKUPSET; RMAN> CONFIGURE CHANNEL 1 DEVICE TYPE disk FORMAT '/home/oracle/disk1/%U'; RMAN> CONFIGURE CHANNEL 2 DEVICE TYPE disk FORMAT '/home/oracle/disk2/%U'; You issue the following RMAN command to backup the database: RMAN> RUN 2> { 3> ALLOCATE CHANNEL ch1 DEVICE TYPE disk; 4> BACKUP DATABASE; 5> } Which statement is true about the outcome?（）
A. Only one channel is allocated and the backup is created in the flash recovery area
B. Only one channel is allocated and the backup is created in the destination specified for channel 1
C. Two channels are allocated and backup sets are created in the destinations specified for channels 1 and 2
D. Three channels are allocated and backup sets are created in the destinations specified for channels 1, 2, and FRA

[单项选择]What does a Layer 2 switch do if it receives a frame with a destination MAC address that is not found in its MAC address table?（）
A. The frame is dropped.
B. The frame is addressed with a broadcast MAC address and sent out all ports.
C. The frame is sent out all ports except the receiving port.
D. An ARP request is sent out all ports except the receiving port.
E. A destination unreachable message is sent back to the source address.
F. None of the above.

[简答题]什么是玻璃纤维增强聚丙烯树脂板（FRA板）？

[单项选择]（） of the A-frames there is a strong cast iron frame called the scavenging air box.
A. At the top
B. At the bottom
C. In the top
D. In the bottom

[单项选择]一份3×6的远期利率协议表示（）的FRA合约。
A. 在3月达成的6月期
B. 3个月后开始的3月期
C. 3个月后开始的6月期
D. 上述说法都不正确

[单项选择]在“1×4FRA”中，合同期的时间长度是（）。
A. 1个月
B. 4个月
C. 3个月
D. 5个月

[单项选择]已知下列即期利率：r₆₀=4%，r₉₀=5%，r₁₅₀=6%（一年按360天）。请问一份3×5FRA的合同利率为（）。
A. 6.0%
B. 6.9%
C. 7.4%
D. 7.9%