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【单选题】
国家标准GB/T3805-2008《特低电压(ELV)限值》中规定,在干燥无故障状态下,对接触面为1.2cm2的50Hz交流电,稳态限值电压(对人体安全的电压)是( )VA.
12V;
B.
24V ;
C.
33V;
D.
70V。
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【单选题】A technician recently installed a new firewall. Which of the following ports must be open to permit HTTPS traffic?（）
A.
21
B.
23
C.
80
D.
443
【简答题】酿酒、味精生产、年糕生产中怎样选择大米？
【简答题】酿酒、味精生产、年糕生产中怎样选择大米?
【单选题】A technician has lost a necessary jumper for a new hard drive that must be installed immediately.Which of the following is the BEST solution?（）
A.
Use a jumper from the motherboard where the new drive is going to be installed.
B.
Use a jumper from a hard drive that is no longer functioning.
C.
Contact the manufacturer of the new hard drive and have a replacement jumper shipped immediately.
D.
The new hard drive must be replaced
【单选题】Woman: Come on, you really must think of the future. Man: I’ll tell you what. I’d really like to be a technician. Q: What does the man want to be in the future?
A.
An accountant.
B.
A technician.
C.
A salesman.
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