某生物兴趣小组为探究食品腐败的原因,设计了如下实验:取两个规格相同的烧瓶,同时灌入等量的肉汤,煮沸降温后进行持续观察.装置如图所示.预测实验的结果,可能性最大的是( )
A:乙腐败时甲没有腐败
B:甲腐败时乙没有腐败
C:甲乙会同时腐败
D:甲乙永不腐败
将下面的名词按可数名词、不可数名词及兼类词(既是可数名词又是不可数名词)进行分类。
clock, boy, girl, book, water, ball, food, banana, tomato, ice-cream, salad, vegetable, egg, pear, chicken, rice
①《曹刿论战》选自《____》,此书传说是____时期____所作,是根据____写的____体史书。
②《曹刿论战》一文指出了战前的政治准备____,叙述了有利于反攻的时机是____之时,叙述了追击开始的时机是____之时,齐鲁____之战是我国历史上____的著名战例之一。
It was reported that a fire broke out in a tall building in Beijing on Thursday afternoon. No one was killed in the fire. The building, which caught fire, is near the three-tower shopping and office complex(综合体) named Xihuan Plaza. One of the three towers was in heavy smoke because of the polyfoam(泡沫塑料)outside. The fire was put out at about 3:34 pm, 16 minutes after the firemen received alarms(报警). Witnesses said the fire broke out at about 3:15 pm. The shopping center had people inside evacuated(疏散)shortly after the fire. By 4:50 pm, all the workers from the center returned. The fire happened on a ____ , when people were working in the office. When the firemen put out the fire, the fire lasted for____ minutes. pThe workers went back to work ____ an hour after the fire was put out. Though the fire frightened people there, it killed ____ . The fire didn’t____ until it was 3:34.
已知直角三角形的三边长都是整数且其面积与周长在数值上相等,那么这样的直角三角形有( )