某鸡场鸡只出现呼吸困难，咳嗽，有黏液性鼻液，常表现为伸头，张口呼吸，并发出咯咯的喘鸣声或尖叫声。嗉囊内有大量积液，倒提时这些液体（酸臭）从口出流出，部分鸡只因昏迷而死亡。剖检病变：嗉囊内充满大量黄色酸臭液体及气体。腺胃粘膜高度水肿，其乳头或乳头间有出血点和溃疡；腺胃和肌胃交界处出血明显：肠外观可见紫红色枣核样肿大的肠淋巴滤泡；盲肠扁桃体肿大，出血，坏死；其他病变不明显。根据以上临床症状和剖检病变可初步诊断为（）
A. 禽流感
B. 鸡传染性法氏囊病
C. 鸡新城疫
D. 真性鸡瘟
E. 禽霍乱
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轧制板带钢影响辊型的主要因素有（）
A. 轧件变形抗力大
B. 轧辊弯曲变形
C. 轧辊磨损不均匀
D. 轧辊受热膨胀
所有的菌类和藻类共生均能形成地衣。
A. 正确
B. 错误
Which two statements about sequences are true? （）
A. You use a NEXTVAL pseudo column to look at the next possible value that would be generated from a sequence, without actually retrieving the value.
B. You use a CURRVAL pseudo column to look at the current value just generated from a sequence, without affecting the further values to be generated from the sequence.
C. You use a NEXTVAL pseudo column to obtain the next possible value from a sequence by actually retrieving the value from the sequence.
D. You use a CURRVAL pseudo column to generate a value from a sequence that would be used for a specified database column.
E. If a sequence starting from a value 100 and incremented by 1 is used by more then one application, then all of these applications could have a value of 105 assigned to their column whose value is being generated by the sequence.
F. You use REUSE clause when creating a sequence to restart the sequence once it generates the maximum value defined for the sequence.
中腰线代表着巷道的方向、位臵、坡度。
A. 正确
B. 错误
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