【单选题】In 2001, R-rated films accounted for the majority of Hollywood films because both domestic and foreign markets were in favor of action movies.
【简答题】According to the MPAA, the movies for which under 17 requires accompanying parent or guardian are rated as ___________.
【简答题】一台活动头磁盘机的盘片组共胡20个可用的盘面,每个盘面直径18英寸,可供记录部分宽5英寸,已知道密度为100道/英寸,位密度为1000位/英寸(最内道)并假定各磁道记录的信息位数相同。试问: (1)盘片组总容量是多少兆位? (2)若要求数据传输率为1MB/s,磁盘机转速每分钟应是多少转?
【简答题】细胞壁的层次,分为______、______和______。
【简答题】细胞死亡又分为_________和_________。
【单选题】A three-phase induction motor has a rated frequency of 50Hz, a rated speed of 2900 r/min, and rated slip of ( ).
【简答题】根据细胞核和细胞器的有无,而将植物的细胞分为_____________细胞和_____________细胞。
【简答题】根据所处的发育阶段于细胞分为( )和( )。根据发育潜能干细胞分为三类:( )、( )和( )。( )是全能干细胞,而( )是多能或单能干细胞。
【单选题】According to Stanton, the movies with the presence of smoking should be rated as_____.