The students _____ at home on Sundays.[ ]
A. stay
B. stays
C. staies
D. to stay
答案:A
闭路电视监控系统系统的供电电源应采用220V、50Hz的单相交流电源,并应配置专门的配电箱。当电压波动超出()时,应设稳压电源装置。
A.-10%~+5%
B.-10%~-5%
C.+5%~+10%
D.-10%~0
Which space cannot be deducted from gross tonnage when calculating net tonnage().
A.Crew messroom
B.Forepeak ballast tank
C.Master's cabin
D.Chain locker