局部剖视图用波浪线作为剖与未剖部分的分界线，波浪线的粗细是粗实线粗细的()。
A. 1/3
B. 2/3
C. 相同
D. 1/2
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在西周宗法制社会背景下，公忠与私忠是两种完全分离的先秦君子精神。
A. 正确
B. 错误
烟花爆竹按照产品的药量及所能构成的危险性分为（）级。
多媒体系统把计算机,家用电器,通信设备组成一个整体而由计算机统一控制和管理。
A. 正确
B. 错误
An International Oil Pollution Prevention Certificate (IOPP) for a "new" vessel ceases to be valid if （）.
A. it exceeds 3 years from date of issue
B. an alteration approved by the Captain of the Port is made
C. an intermediate survey has not be conducted within 12 months from the date that the IOPP was issued
D. the vessel is transferred to the flag of another country
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