在空气中二氧化碳的质量分数达()时,霉菌全部死亡(孢子除外)。
A. 20%
B. 30%
C. 50%
D. 60%
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Anadministratorhasjustinstalledawebserverforthecompany'sInternetsite.Afterbringingthesystemonline,customersnotifytheadministratorthattheycannotconnecttotheserver.Theadministratorteststhewebserverfromaworkstationandcanaccessthewebsite.Thecustomerscontinuetoreportissues. WhichofthefollowingistheMOSTlikelyreasonforthis?()
A. Theserver'sfirewallismisconfigured.
B. Theserver'stimeoutfeatureissetincorrectly.
C. Thewebserverwasnotinstalledproperly.
D. Thecompanyfirewallismisconfigured.
对于运距在150km范围内直接采购的生产资料,最适宜的运输方式是()。
A. 管道
B. 铁路
C. 公路
D. 水运
在一定条件下,霉菌可能对包装件产生危害,最适宜霉菌发芽生长的气候条件是相对湿度为()以上的环境。
A. 55%
B. 65%
C. 75%
D. 90%
Anadministratorfindsaphonelinebutdoesnotknowwherethelinegoesorifitisactive.Whichofthefollowingcanbeusedtotestifitisactive?()
A. Buttset
B. Punchdowntool
Cableteste
D. Cablestripper