According to Annex V to MARPOL 73/78,garbage containing plastic is permitted to be disposed of by().
A. Incinerating offshore
B. Discharging when at least 12 nautical miles from nearest land
C. Grinding to less than 1 and discharging at least 12 nautical miles from nearest land
D. Grinding to less than 1 and discharging at least 25 nautical miles from nearest land
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中国电信、中国联通、中国网通等这些为普通用户提供Internet接入服务的公司被称为()。
A. PSI
B. URL
C. InternetServer
D. ISP
要使用前登机梯机内控制面板上的备用电门操作梯子,必须将电瓶电门放到”ON”才可以。
A. 正确
B. 错误
对于我国50Hz系统,要求在短路后的20ms时,二次暂态电压峰值不应大于短路前电压峰值的0.1
A. 正确
B. 错误
常用的数比形式是()
A. 1:2~1:4
B. 12~1:6
C. 1:2~1:8
D. 1:2~1:9